arm: samsung: Migrate a number of symbols to Kconfig

- In a number of cases, use CONFIG_ARCH_EXYNOS[45] rather than
  CONFIG_EXYNOS[45]
- In other cases, test for CONFIG_ARCH_EXYNOS or CONFIG_ARCH_S5PC1XX
- Migrate specific SoC CONFIG values to Kconfig
- Use CONFIG_TARGET_x rather than CONFIG_x
- Migrate other CONFIG_EXYNOS_x symbols to Kconfig
- Reference CONFIG_EXYNOS_RELOCATE_CODE_BASE directly as EXYNOS_RELOCATE_CODE_BASE
- Rename CONFIG_S5P_PA_SYSRAM to CONFIG_SMP_PEN_ADDR to match the rest
  of U-Boot usage.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e682d65..ddef3d0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -609,6 +609,9 @@
 	help
 	  This ARM64 system supports AArch32 execution state.
 
+config S5P
+	def_bool y if ARCH_EXYNOS || ARCH_S5PC1XX
+
 choice
 	prompt "Target select"
 	default TARGET_HIKEY