memory: samsung: exynos-srom: Describe the Kconfig entry

config EXYNOS_SROM

	bool "Exynos SROM controller driver" if COMPILE_TEST

	depends on (ARM && ARCH_EXYNOS) || (COMPILE_TEST && HAS_IOMEM)

	help

	  This adds driver for Samsung Exynos SoC SROM controller.  The driver

	  in basic operation mode only saves and restores SROM registers

	  during suspend.  If however appropriate device tree configuration

	  is provided, the driver enables support for external memory

	  or external devices.

	  If unsure, say Y on devices with Samsung Exynos SocS.

endif