arm: SC584-EZKIT initial support

Adds support for Analog Devices' SC584-EZKIT board. Includes:
- SoC specific configs in mach-sc5xx/Kconfig
- Memory Map for SPL
- SPL config options in common/spl/Kconfig
- 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: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index e723ff1..a7378be 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -87,6 +87,7 @@
 	default 0x10000 if ASPEED_AST2600
 	default 0x27000 if IMX8MM && SPL_TEXT_BASE = 0x7E1000
 	default 0x30000 if ARCH_SC5XX && (SC59X_64 || SC59X)
+	default 0x20000 if ARCH_SC5XX && SC58X
 	default 0x0
 	help
 	  Maximum size of the SPL image (text, data, rodata, and linker lists
@@ -124,6 +125,7 @@
 	default 0x2ff80000 if ARCH_SUNXI && MACH_SUN9I
 	default 0x1000 if ARCH_ZYNQMP
 	default 0x200B0000 if ARCH_SC5XX && (SC59X_64 || SC59X)
+	default 0x20080000 if ARCH_SC5XX && SC58X
 
 choice
 	prompt "Enforce SPL BSS limit"
@@ -395,6 +397,7 @@
 	default 0x18000 if MACH_SUN9I
 	default 0x8000 if ARCH_SUNXI
 	default 0x200E4000 if ARCH_SC5XX && (SC59X_64 || SC59X)
+	default 0x200B0000 if ARCH_SC5XX && SC58X
 	help
 	  Address of the start of the stack SPL will use before SDRAM is
 	  initialized.