arm: SC598-SOM-EZKIT initial support

Adds support for Analog Devices' SC598-SOM-EZKIT board. Includes:
- CONFIG options common to all SC5xx SoCs
- SoC specific configs in mach-sc5xx/Kconfig
- SPL config options in common/spl/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>
Co-developed-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 0bc7f2f..0f4eee3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -607,12 +607,14 @@
 F:	arch/arm/dts/sc5*
 F:	arch/arm/include/asm/arch-adi/
 F:	arch/arm/mach-sc5xx/
+F:	board/adi/
 F:	doc/device-tree-bindings/arm/adi/adi,sc5xx.yaml
 F:	doc/device-tree-bindings/clock/adi,sc5xx-clocks.yaml
 F:	doc/device-tree-bindings/timer/adi,sc5xx-gptimer.yaml
 F:	drivers/clk/adi/
 F:	drivers/serial/serial_adi_uart4.c
 F:	drivers/timer/adi_sc5xx_timer.c
+F:	include/configs/sc5*
 F:	include/env/adi/
 
 ARM SNAPDRAGON