hwrng: Kconfig - Add HAS_IOMEM dependencies for exynos/meson/mtk/npcm

Add missing dependencies on HAS_IOMEM as otherwise they will trigger
failed builds with COMPILE_TEST enabled.

Also add dependencies on OF where appropriate.

Change the default so that these drivers are not enabled just because
COMPILE_TEST is turned on.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304191106.swKbBeDh-lkp@intel.com/Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Łukasz Stelmach <l.stelmach@samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/Kconfig

@@ -400,9 +400,9 @@ config HW_RANDOM_POLARFIRE_SOC
 
 config HW_RANDOM_MESON
 	tristate "Amlogic Meson Random Number Generator support"
-	depends on HW_RANDOM
 	depends on ARCH_MESON || COMPILE_TEST
-	default y
+	depends on HAS_IOMEM && OF
+	default HW_RANDOM if ARCH_MESON
 	help
 	  This driver provides kernel-side support for the Random Number
 	  Generator hardware found on Amlogic Meson SoCs.
@@ -427,9 +427,9 @@ config HW_RANDOM_CAVIUM
 
 config HW_RANDOM_MTK
 	tristate "Mediatek Random Number Generator support"
-	depends on HW_RANDOM
 	depends on ARCH_MEDIATEK || COMPILE_TEST
-	default y
+	depends on HAS_IOMEM && OF
+	default HW_RANDOM if ARCH_MEDIATEK
 	help
 	  This driver provides kernel-side support for the Random Number
 	  Generator hardware found on Mediatek SoCs.
@@ -456,7 +456,8 @@ config HW_RANDOM_S390
 config HW_RANDOM_EXYNOS
 	tristate "Samsung Exynos True Random Number Generator support"
 	depends on ARCH_EXYNOS || COMPILE_TEST
-	default HW_RANDOM
+	depends on HAS_IOMEM
+	default HW_RANDOM if ARCH_EXYNOS
 	help
 	  This driver provides support for the True Random Number
 	  Generator available in Exynos SoCs.
@@ -483,7 +484,8 @@ config HW_RANDOM_OPTEE
 config HW_RANDOM_NPCM
 	tristate "NPCM Random Number Generator support"
 	depends on ARCH_NPCM || COMPILE_TEST
-	default HW_RANDOM
+	depends on HAS_IOMEM
+	default HW_RANDOM if ARCH_NPCM
 	help
 	  This driver provides support for the Random Number
 	  Generator hardware available in Nuvoton NPCM SoCs.