arm: SC573-EZKIT initial support

Adds support for Analog Devices' SC573-EZKIT board. Includes:
- SoC specific configs in mach-sc5xx/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>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/arch/arm/mach-sc5xx/Kconfig b/arch/arm/mach-sc5xx/Kconfig
index 6f8ea45..30444f0 100644
--- a/arch/arm/mach-sc5xx/Kconfig
+++ b/arch/arm/mach-sc5xx/Kconfig
@@ -25,6 +25,7 @@
 	bool "SC57x series"
 	select COMMON_CLK_ADI_SC57X
 	select CPU_V7A
+	select TARGET_SC573_EZKIT
 
 config SC58X
 	bool "SC58x series"
@@ -49,6 +50,13 @@
 
 endchoice
 
+if SC57X
+
+config TARGET_SC573_EZKIT
+	bool "Support SC573-EZKIT"
+
+endif
+
 if SC58X
 
 choice
@@ -555,5 +563,6 @@
 source "board/adi/sc589-ezkit/Kconfig"
 source "board/adi/sc589-mini/Kconfig"
 source "board/adi/sc584-ezkit/Kconfig"
+source "board/adi/sc573-ezkit/Kconfig"
 
 endif