MPC8308RDB: minimal support for devboard from Freescale

This patch provides support for MPC8308RDB development board from
Freescale with a minimal set of features:
 Dual UART is supported
 NOR flash is supported
 Both TSEC Ethernet controllers are supported
 PCI Express initialization is supported

The following features are enabled in configuration but not fully tested:
 I2C (used to get the board revision)
 I2C-connected RTC
 VSC7385 switch

There is one (hopefully) minor issue: on soft reset the board sometimes
resets twice. I've not managed to find the fix for this problem yet.
As a workaround instruction cache can be disabled.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9485070..d9158ce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -490,6 +490,10 @@
 
 	JSE		PPC405GPr
 
+Ilya Yanok <yanok@emcraft.com>
+
+	MPC8308RDB	MPC8308
+
 Roy Zang <tie-fei.zang@freescale.com>
 
 	mpc7448hpc2	MPC7448