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/board/adi/sc598-som-ezkit/Kconfig b/board/adi/sc598-som-ezkit/Kconfig
new file mode 100644
index 0000000..9abecbe
--- /dev/null
+++ b/board/adi/sc598-som-ezkit/Kconfig
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# (C) Copyright 2024 - Analog Devices, Inc.
+
+if TARGET_SC598_SOM_EZKIT
+
+config LDR_CPU
+	default "ADSP-SC598-0.0"
+
+config SYS_BOARD
+	default "sc598-som-ezkit"
+
+config SYS_CONFIG_NAME
+	default "sc598-som"
+
+config DEFAULT_DEVICE_TREE
+	default "sc598-som-ezkit"
+
+config ADI_IMAGE
+	default "minimal"
+
+config CUSTOM_SYS_INIT_SP_ADDR
+	default 0x96000000
+
+# SPL
+
+config SPL_OF_LIBFDT_ASSUME_MASK
+	default 0x0
+
+# SPI Flash
+
+config SF_DEFAULT_BUS
+	default 2
+
+config SF_DEFAULT_CS
+	default 1
+
+config SF_DEFAULT_SPEED
+	default 10000000
+
+# Clock Configs
+
+config CGU0_DF_DIV
+	default 0
+
+config CGU0_VCO_MULT
+	default 80
+
+config CGU0_CCLK_DIV
+	default 2
+
+config CGU0_SCLK_DIV
+	default 4
+
+config CGU0_SCLK0_DIV
+	default 4
+
+config CGU0_SCLK1_DIV
+	default 2
+
+config CGU0_DCLK_DIV
+	default 3
+
+config CGU0_OCLK_DIV
+	default 8
+
+config CGU0_DIV_S1SELEX
+	default 6
+
+config CGU1_VCO_MULT
+	default 72
+
+config CGU1_DF_DIV
+	default 0
+
+config CGU1_CCLK_DIV
+	default 16
+
+config CGU1_SCLK_DIV
+	default 8
+
+config CGU1_SCLK0_DIV
+	default 4
+
+config CGU1_SCLK1_DIV
+	default 2
+
+config CGU1_DCLK_DIV
+	default 18
+
+config CGU1_OCLK_DIV
+	default 16
+
+config CGU1_DIV_S0SELEX
+	default 36
+
+config CGU1_DIV_S1SELEX
+	default 90
+
+endif