arm: mvebu: Add CRS326-24G-2S board

MikroTik CRS326-24G-2S board has a switch chip with an integrated
Marvell Prestera 98DX3236 CPU.

This commit includes two board variants, namely the factory
default one and a Bit variant. The Bit board variant has a
bigger Macronix flash.

Add basic U-Boot, UART and SPI flash support.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Jakov Petrina <jakov.petrina@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/mikrotik/crs3xx-98dx3236/MAINTAINERS b/board/mikrotik/crs3xx-98dx3236/MAINTAINERS
index d02584b..7f01f43 100644
--- a/board/mikrotik/crs3xx-98dx3236/MAINTAINERS
+++ b/board/mikrotik/crs3xx-98dx3236/MAINTAINERS
@@ -12,3 +12,12 @@
 F:	configs/crs305-1g-4s-bit_defconfig
 F:	arch/arm/dts/armada-xp-crs305-1g-4s.dts
 F:	arch/arm/dts/armada-xp-crs305-1g-4s-bit.dts
+
+CRS326-24G-2S BOARD
+M:	Luka Kovacic <luka.kovacic@sartura.hr>
+M:	Luka Perkov <luka.perkov@sartura.hr>
+S:	Maintained
+F:	configs/crs326-24g-2s_defconfig
+F:	configs/crs326-24g-2s-bit_defconfig
+F:	arch/arm/dts/armada-xp-crs326-24g-2s.dts
+F:	arch/arm/dts/armada-xp-crs326-24g-2s-bit.dts