arm: pxa: Add support for ICP DAS LP-8x4x

LP-8x4x is a programmable automation controller by ICP DAS. It is
shipped with outdated U-Boot v1.3.0

This patch adds enough supports to boot the board:
 - 128M of 128M SDRAM
 - 32M of 48M NOR Flash memory
 - 1 of 4 Serial consoles (PXA FFUART)
 - 2 of 2 Ethernet controllers (DM9000)

Signed-off-by: Sergey Yanovich <ynvich@gmail.com>
Series-to: u-boot
Series-cc: marex
diff --git a/MAINTAINERS b/MAINTAINERS
index 4871236..7820375 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1074,6 +1074,10 @@
 
 	vf610twr	VF610
 
+Sergey Yanovich <ynvich@gmail.com>
+
+	lp8x4x		xscale/pxa
+
 -------------------------------------------------------------------------
 
 Unknown / orphaned boards: