memory: move mmio access to functions

Upstream acbbec5d438dcf04234519bac53e1f5263572d76

Change-Id: If0e08248bb93c345e7d112280f3aa23b6e295ad9
diff --git a/Makefile.target b/Makefile.target
index 6973ebc..8076af4 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -172,6 +172,7 @@
     cputlb.c \
     exec.c \
     main-loop.c \
+    memory-android.c \
     monitor-android.c \
     translate-all.c \
     android/varint.c \