arm: mvebu: Add CRS305-1G-4S board

CRS305-1G-4S has a switch chip with an integrated CPU (98DX3236) and
like some of the other similar boards requires bin_hdr.
bin_hdr (DDR3 init stage) is currently retrieved from the stock
bootloader and compiled into the kwb image.

Adds support for U-Boot, enable UART, SPI, Winbond SPI flash chip
support and writing env to SPI flash.

Signed-off-by: Luka Kovacic <me@lukakovacic.xyz>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index a832e1d..495c48e 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -164,6 +164,10 @@
 	bool "Support DB-XC3-24G4XG"
 	select 98DX3336
 
+config TARGET_CRS305_1G_4S
+	bool "Support CRS305-1G-4S"
+	select 98DX3236
+
 endchoice
 
 config SYS_BOARD
@@ -183,6 +187,7 @@
 	default "a38x" if TARGET_CONTROLCENTERDC
 	default "x530" if TARGET_X530
 	default "db-xc3-24g4xg" if TARGET_DB_XC3_24G4XG
+	default "crs305-1g-4s" if TARGET_CRS305_1G_4S
 
 config SYS_CONFIG_NAME
 	default "clearfog" if TARGET_CLEARFOG
@@ -201,6 +206,7 @@
 	default "controlcenterdc" if TARGET_CONTROLCENTERDC
 	default "x530" if TARGET_X530
 	default "db-xc3-24g4xg" if TARGET_DB_XC3_24G4XG
+	default "crs305-1g-4s" if TARGET_CRS305_1G_4S
 
 config SYS_VENDOR
 	default "Marvell" if TARGET_DB_MV784MP_GP
@@ -218,6 +224,7 @@
 	default "CZ.NIC" if TARGET_TURRIS_MOX
 	default "gdsys" if TARGET_CONTROLCENTERDC
 	default "alliedtelesis" if TARGET_X530
+	default "mikrotik" if TARGET_CRS305_1G_4S
 
 config SYS_SOC
 	default "mvebu"