Enable user to access /tmp partition

Required by weston service log.

Change-Id: I601b323704b733a5b6372d025ba2d9ed1d72e5f5
Tested: Build and run
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 9c3d9ea..54106f3 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -756,6 +756,8 @@
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_BTRFS_FS=m
 CONFIG_BTRFS_FS_POSIX_ACL=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_FANOTIFY=y
 CONFIG_FANOTIFY_ACCESS_PERMISSIONS=y
 CONFIG_QUOTA=y