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/Kconfig b/Kconfig
index 2422b94..bdae1b0 100644
--- a/Kconfig
+++ b/Kconfig
@@ -648,6 +648,7 @@
 	default 0x96000000 if ARCH_SC5XX && SC59X_64
 	default 0xB2200000 if ARCH_SC5XX && SC59X
 	default 0x89200000 if ARCH_SC5XX && TARGET_SC584_EZKIT
+	default 0xC2200000 if ARCH_SC5XX && TARGET_SC589_EZKIT
 	hex "Text Base"
 	help
 	  The address in memory that U-Boot will be copied and executed from