powerpc/p1010rdb:modify the mtest start_address

In new board P1010RDB-PB, the interrupt vector table is at
the start of memory. So if the start_address needs to be set
a proper value.

Signed-off-by: Zhao Qiang <B45475@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>

include/configs/P1010RDB.h

@@ -173,7 +173,7 @@
 #define CONFIG_SYS_NUM_ADDR_MAP		16	/* number of TLB1 entries */
 #endif
 
-#define CONFIG_SYS_MEMTEST_START	0x00000000	/* memtest works on */
+#define CONFIG_SYS_MEMTEST_START	0x00200000	/* memtest works on */
 #define CONFIG_SYS_MEMTEST_END		0x1fffffff
 #define CONFIG_PANIC_HANG		/* do not reset board on panic */