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/arch/arm/mach-sc5xx/Kconfig b/arch/arm/mach-sc5xx/Kconfig
index b57c21c..ac2b669 100644
--- a/arch/arm/mach-sc5xx/Kconfig
+++ b/arch/arm/mach-sc5xx/Kconfig
@@ -49,6 +49,20 @@
 
 endchoice
 
+if SC58X
+
+choice
+	prompt "SC58x board select"
+
+config TARGET_SC584_EZKIT
+	bool
+	prompt "SC584-EZKIT"
+	select ADI_USE_DDR2
+
+endchoice
+
+endif
+
 if SC59X
 
 choice
@@ -530,5 +544,6 @@
 source "board/adi/sc598-som-ezlite/Kconfig"
 source "board/adi/sc594-som-ezkit/Kconfig"
 source "board/adi/sc594-som-ezlite/Kconfig"
+source "board/adi/sc584-ezkit/Kconfig"
 
 endif