arm64: exynos: don't have ARCH_EXYNOS select EXYNOS_CHIPID

Now that EXYNOS_CHIPID can be a module and is enabled by default via
ARCH_EXYNOS, we don't need to have ARCH_EXYNOS directly select it. So
remove that.
Signed-off-by: Will McVicker <willmcvicker@google.com>
Link: https://lore.kernel.org/r/20210928235635.1348330-2-willmcvicker@google.com
[krzysztof: the driver is not essential to boot and on ARMv7 it is also
 allowed to disable it]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

arch/arm64/Kconfig.platforms

@@ -92,7 +92,6 @@ config ARCH_BRCMSTB
 config ARCH_EXYNOS
 	bool "ARMv8 based Samsung Exynos SoC family"
 	select COMMON_CLK_SAMSUNG
-	select EXYNOS_CHIPID
 	select EXYNOS_PM_DOMAINS if PM_GENERIC_DOMAINS
 	select EXYNOS_PMU
 	select HAVE_S3C_RTC if RTC_CLASS