target: msm9640: Fix memory map

Update the msm9640 rules file as the original memory map.

Change-Id: Idcfb0b95c66baed08086136e87ba45890727173c
diff --git a/target/mdm9640/rules.mk b/target/mdm9640/rules.mk
index f8c6d35..84d1417 100644
--- a/target/mdm9640/rules.mk
+++ b/target/mdm9640/rules.mk
@@ -4,7 +4,7 @@
 
 PLATFORM := mdm9640
 
-MEMBASE                             := 0x81200000
+MEMBASE                             := 0x87C00000
 MEMSIZE                             := 0x00100000 # 1MB
 BASE_ADDR                           := 0x80000000
 SCRATCH_ADDR                        := 0x80000000