ppc4xx: Move virtual address of POST cache test to bigger address

On Sequoia & LWMON5 the virtual address of the POST cache test is now
moved to a bigger address. This enables usage of more memory on those
boards.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/sequoia.h b/include/configs/sequoia.h
index 48a64e3..1f72b54 100644
--- a/include/configs/sequoia.h
+++ b/include/configs/sequoia.h
@@ -377,7 +377,7 @@
 
 #define CFG_POST_WORD_ADDR	(CFG_GBL_DATA_OFFSET - 0x4)
 #define CONFIG_LOGBUFFER
-#define CFG_POST_CACHE_ADDR	0x10000000 /* free virtual address	*/
+#define CFG_POST_CACHE_ADDR	0x7fff0000 /* free virtual address	*/
 
 #define CFG_CONSOLE_IS_IN_ENV /* Otherwise it catches logbuffer as output */