arm64: add Airoha EN7581 platform

Introduce the Kconfig entry for the Airoha EN7581 multicore architecture
available in the Airoha EN7581 evaluation board.

Signed-off-by: Daniel Danzberger <dd@embedd.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/d52d95db313e6a58ba997ba2181faf78a1014bcc.1709975956.git.lorenzo@kernel.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/Kconfig.platforms

@@ -8,6 +8,13 @@ config ARCH_ACTIONS
 	help
 	  This enables support for the Actions Semiconductor S900 SoC family.
 
+config ARCH_AIROHA
+	bool "Airoha SoC Support"
+	select ARM_PSCI
+	select HAVE_ARM_ARCH_TIMER
+	help
+	  This enables support for the ARM64 based Airoha SoCs.
+
 config ARCH_SUNXI
 	bool "Allwinner sunxi 64-bit SoC Family"
 	select ARCH_HAS_RESET_CONTROLLER