Increase Emulator system image to 72MB

This is required to run the SDK system image with the new assets
in multiple densities.

Change-Id: I4ab21a9c5ef554d1d8d63a32c3e88719e6d49253
diff --git a/android/avd/hardware-properties.ini b/android/avd/hardware-properties.ini
index 09486d2..8744d64 100644
--- a/android/avd/hardware-properties.ini
+++ b/android/avd/hardware-properties.ini
@@ -128,7 +128,7 @@
 name        = disk.systemPartition.size
 type        = diskSize
 abstract    = System partition size
-default     = 66MB
+default     = 72MB
 
 # Data partition
 name        = disk.dataPartition.size
diff --git a/android/avd/hw-config-defs.h b/android/avd/hw-config-defs.h
index 67bd3d3..b98f511 100644
--- a/android/avd/hw-config-defs.h
+++ b/android/avd/hw-config-defs.h
@@ -125,7 +125,7 @@
 HWCFG_DISKSIZE(
   disk_systemPartition_size,
   "disk.systemPartition.size",
-  "66MB",
+  "72MB",
   "System partition size",
   "")