arm: SC589-EZKIT initial support

Adds support for Analog Devices' SC589-EZKIT board. Includes:
- Board specific configs in mach-sc5xx/Kconfig
- Board-specific Kconfig and environment in board/adi/
- Memory configuration

Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/arch/arm/mach-sc5xx/Kconfig b/arch/arm/mach-sc5xx/Kconfig
index ac2b669..408b943 100644
--- a/arch/arm/mach-sc5xx/Kconfig
+++ b/arch/arm/mach-sc5xx/Kconfig
@@ -59,6 +59,10 @@
 	prompt "SC584-EZKIT"
 	select ADI_USE_DDR2
 
+config TARGET_SC589_EZKIT
+	bool
+	prompt "SC589-EZKIT"
+
 endchoice
 
 endif
@@ -544,6 +548,7 @@
 source "board/adi/sc598-som-ezlite/Kconfig"
 source "board/adi/sc594-som-ezkit/Kconfig"
 source "board/adi/sc594-som-ezlite/Kconfig"
+source "board/adi/sc589-ezkit/Kconfig"
 source "board/adi/sc584-ezkit/Kconfig"
 
 endif