soc: samsung: exynos-chipid: do not enforce built-in

After converting the Exynos ChipID and ASV driver to a module, allow to
actually choose it to be a module, while being a default built-in.  The
side effect is that driver could be now entirely disabled even for
kernel with ARCH_EXYNOS, but this is not a critical issue because driver
is not necessary for the proper platform boot.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Sylwester Nawrocki <snawrocki@kernel.org>
Tested-by: Sylwester Nawrocki <snawrocki@kernel.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210919093114.35987-4-krzysztof.kozlowski@canonical.com

arch/arm/mach-exynos/Kconfig

@@ -13,7 +13,6 @@ menuconfig ARCH_EXYNOS
 	select ARM_GIC
 	select EXYNOS_IRQ_COMBINER
 	select COMMON_CLK_SAMSUNG
-	select EXYNOS_CHIPID
 	select EXYNOS_THERMAL
 	select EXYNOS_PMU
 	select EXYNOS_SROM

drivers/soc/samsung/Kconfig

@@ -13,8 +13,9 @@ config EXYNOS_ASV_ARM
 	depends on EXYNOS_CHIPID
 
 config EXYNOS_CHIPID
-	tristate "Exynos ChipID controller and ASV driver" if COMPILE_TEST
+	tristate "Exynos ChipID controller and ASV driver"
 	depends on ARCH_EXYNOS || COMPILE_TEST
+	default ARCH_EXYNOS
 	select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
 	select MFD_SYSCON
 	select SOC_BUS