arm: SC598-SOM-EZKIT initial support

Adds support for Analog Devices' SC598-SOM-EZKIT board. Includes:
- CONFIG options common to all SC5xx SoCs
- SoC specific configs in mach-sc5xx/Kconfig
- SPL config options in common/spl/Kconfig
- Memory Map for SPL
- Necessary board-specific init functions
- Board-specific Kconfig and environment in board/adi/
- Memory configuration

Co-developed-by: Greg Malysa <greg.malysa@timesys.com>
Signed-off-by: Greg Malysa <greg.malysa@timesys.com>
Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Co-developed-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/Kconfig b/Kconfig
index 82df59f..1596139 100644
--- a/Kconfig
+++ b/Kconfig
@@ -208,7 +208,7 @@
 
 config NR_DRAM_BANKS
 	int "Number of DRAM banks"
-	default 1 if ARCH_SUNXI || ARCH_OWL
+	default 1 if ARCH_SC5XX || ARCH_SUNXI || ARCH_OWL
 	default 4
 	help
 	  This defines the number of DRAM banks.
@@ -545,6 +545,7 @@
 	default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 	default 0x80800000 if ARCH_MX7
 	default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
+	default 0x0 if ARCH_SC5XX
 	help
 	  Address in memory to use as the default safe load address.
 
@@ -644,6 +645,7 @@
 	default 0x2a000000 if MACH_SUN9I
 	default 0x4a000000 if SUNXI_MINIMUM_DRAM_MB >= 256
 	default 0x42e00000 if SUNXI_MINIMUM_DRAM_MB >= 64
+	default 0x96000000 if ARCH_SC5XX && SC59X_64
 	hex "Text Base"
 	help
 	  The address in memory that U-Boot will be copied and executed from