staging: omap-thermal: change Kconfig dependency method

Now arch code has to specify CONFIG_ARCH_HAS_BANDGAP. So, this driver
will be selectable only if the platform reports itself as having a
bandgap device.

Any OMAP variant or any other OMAP version needs to
	select ARCH_HAS_BANDGAP
so that the driver will be applicable. A part from that it is
required to device the data structures that maps the registers
and their bitfields. The DT compatible list must also be updated.

CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
CC: Vaibhav Bedia <vaibhav.bedia@ti.com>

Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/omap-thermal/Kconfig

@@ -1,7 +1,7 @@
 config OMAP_BANDGAP
 	tristate "Texas Instruments OMAP4+ temperature sensor driver"
 	depends on THERMAL
-	depends on ARCH_OMAP4 || SOC_OMAP5
+	depends on ARCH_HAS_BANDGAP
 	help
 	  If you say yes here you get support for the Texas Instruments
 	  OMAP4460+ on die bandgap temperature sensor support. The register

drivers/staging/omap-thermal/TODO

@@ -20,7 +20,6 @@ on omap5-thermal.c
 - Add support for GPU cooling
 
 generally:
-- write Kconfig dependencies so that omap variants are covered
 - make checkpatch.pl and sparse happy
 - make sure this code works on OMAP4430, OMAP4460 and OMAP5430
 - update documentation