ppc4xx: Add T3COPR board support (PPC460GT based)

This patch adds support for the T3CORP board, based on the
AppliedMicro (APM) PPC460GT.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAKEALL b/MAKEALL
index 27f8bd1..4637390 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -262,6 +262,7 @@
 	sc3		\
 	sequoia		\
 	sequoia_nand	\
+	t3corp		\
 	taihu		\
 	taishan		\
 	v5fx30teval	\