mellanox: Relocate mlx-platform driver

Move 'mlx-platform' driver 'x86' to 'mellanox' folder.

Motivation to allow running it on systems with ARM architecture.

Since drivers/platform/x86/mlx-platform.c is rellocated to folder
drivers/platform/x86/, remove "MELLANOX PLATFORM DRIVER" item.
This driver will be located under "MELLANOX HARDWARE PLATFORM SUPPORT"
item.

Reviewed-by: Michael Shych <michaelsh@nvidia.com>
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20250124172632.22437-2-vadimp@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

MAINTAINERS

@@ -15098,12 +15098,6 @@ F:	Documentation/leds/leds-mlxcpld.rst
 F:	drivers/leds/leds-mlxcpld.c
 F:	drivers/leds/leds-mlxreg.c
 
-MELLANOX PLATFORM DRIVER
-M:	Vadim Pasternak <vadimp@nvidia.com>
-L:	platform-driver-x86@vger.kernel.org
-S:	Supported
-F:	drivers/platform/x86/mlx-platform.c
-
 MEMBARRIER SUPPORT
 M:	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 M:	"Paul E. McKenney" <paulmck@kernel.org>

drivers/platform/mellanox/Kconfig

@@ -14,6 +14,19 @@ menuconfig MELLANOX_PLATFORM
 
 if MELLANOX_PLATFORM
 
+config MLX_PLATFORM
+	tristate "Mellanox Technologies platform support"
+	depends on ACPI && I2C && PCI
+	select REGMAP
+	help
+	  This option enables system support for the Mellanox Technologies
+	  platform. The Mellanox systems provide data center networking
+	  solutions based on Virtual Protocol Interconnect (VPI) technology
+	  enable seamless connectivity to 56/100Gb/s InfiniBand or 10/40/56GbE
+	  connection.
+
+	  If you have a Mellanox system, say Y or M here.
+
 config MLXREG_HOTPLUG
 	tristate "Mellanox platform hotplug driver support"
 	depends on HWMON

drivers/platform/mellanox/Makefile

@@ -3,6 +3,7 @@
 # Makefile for linux/drivers/platform/mellanox
 # Mellanox Platform-Specific Drivers
 #
+obj-$(CONFIG_MLX_PLATFORM)	+= mlx-platform.o
 obj-$(CONFIG_MLXBF_BOOTCTL)	+= mlxbf-bootctl.o
 obj-$(CONFIG_MLXBF_PMC)		+= mlxbf-pmc.o
 obj-$(CONFIG_MLXBF_TMFIFO)	+= mlxbf-tmfifo.o

drivers/platform/x86/Kconfig

@@ -1012,19 +1012,6 @@ config SERIAL_MULTI_INSTANTIATE
 	  To compile this driver as a module, choose M here: the module
 	  will be called serial-multi-instantiate.
 
-config MLX_PLATFORM
-	tristate "Mellanox Technologies platform support"
-	depends on ACPI && I2C && PCI
-	select REGMAP
-	help
-	  This option enables system support for the Mellanox Technologies
-	  platform. The Mellanox systems provide data center networking
-	  solutions based on Virtual Protocol Interconnect (VPI) technology
-	  enable seamless connectivity to 56/100Gb/s InfiniBand or 10/40/56GbE
-	  connection.
-
-	  If you have a Mellanox system, say Y or M here.
-
 config TOUCHSCREEN_DMI
 	bool "DMI based touchscreen configuration info"
 	depends on ACPI && DMI && I2C=y && TOUCHSCREEN_SILEAD

drivers/platform/x86/Makefile

@@ -122,7 +122,6 @@ obj-$(CONFIG_TOPSTAR_LAPTOP)	+= topstar-laptop.o
 # Platform drivers
 obj-$(CONFIG_FW_ATTR_CLASS)		+= firmware_attributes_class.o
 obj-$(CONFIG_SERIAL_MULTI_INSTANTIATE)	+= serial-multi-instantiate.o
-obj-$(CONFIG_MLX_PLATFORM)		+= mlx-platform.o
 obj-$(CONFIG_TOUCHSCREEN_DMI)		+= touchscreen_dmi.o
 obj-$(CONFIG_WIRELESS_HOTKEY)		+= wireless-hotkey.o
 obj-$(CONFIG_X86_ANDROID_TABLETS)	+= x86-android-tablets/