platform: mdm9x25: Modify physical to virtual mapping for scratch address

Modify physical to virtual mapping for scratch address according
to the new memory map.

Change-Id: I3ede0a7621675dbfd50e553f6c8f6f7f6896c7a1
diff --git a/platform/mdm9x25/platform.c b/platform/mdm9x25/platform.c
index 71478de..776cb5e 100644
--- a/platform/mdm9x25/platform.c
+++ b/platform/mdm9x25/platform.c
@@ -57,7 +57,7 @@
 #define IOMAP_MEMORY                          (MMU_MEMORY_TYPE_DEVICE_SHARED | \
                                               MMU_MEMORY_AP_READ_WRITE | MMU_MEMORY_XN)
 
-#define SCRATCH_REGION1_VIRT_START            (MEMBASE + MEMSIZE)
+#define SCRATCH_REGION1_VIRT_START            SCRATCH_REGION1
 #define SCRATCH_REGION2_VIRT_START            (SCRATCH_REGION1_VIRT_START + \
                                               (SCRATCH_REGION1_SIZE))