powerpc, 5xxx, 512x: remove support for mpc5xxx and mpc512x

There was for long time no activity in the mpx5xxx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in mpc5xxx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/post.h b/include/post.h
index 8bee125..b9b9c37 100644
--- a/include/post.h
+++ b/include/post.h
@@ -22,14 +22,7 @@
 #define _POST_WORD_ADDR	CONFIG_SYS_POST_WORD_ADDR
 #else
 
-#ifdef CONFIG_MPC5xxx
-#define _POST_WORD_ADDR	(MPC5XXX_SRAM + MPC5XXX_SRAM_POST_SIZE)
-
-#elif defined(CONFIG_MPC512X)
-#define _POST_WORD_ADDR \
-	(CONFIG_SYS_SRAM_BASE + CONFIG_SYS_GBL_DATA_OFFSET - 0x4)
-
-#elif defined(CONFIG_MPC8360)
+#if defined(CONFIG_MPC8360)
 #include <linux/immap_qe.h>
 #define _POST_WORD_ADDR	(CONFIG_SYS_IMMR + CPM_POST_WORD_ADDR)