fstab files: update to mount cache with noatime option

as it is reported by cts test:
android.os.cts.EnvironmentTest.testNoAtime junit.framework.AssertionFailedError: Found device mounted at /dev/block/platform/soc/f723d000.dwmmc0/by-name/cache without 'noatime' option, which can cause unnecessary flash churn; please update your fstab.

Test: manually with cts android.os.cts.EnvironmentTest#testNoAtime test

Change-Id: Id9f6c7a5cbb74888805047c7da172c1db10f737d
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
diff --git a/hikey/fstab.hikey b/hikey/fstab.hikey
index 06a1360..8c3d816 100644
--- a/hikey/fstab.hikey
+++ b/hikey/fstab.hikey
@@ -5,8 +5,8 @@
 
 /dev/block/platform/soc/f723d000.dwmmc0/by-name/system      /system             ext4      ro                                                           wait
 /dev/block/platform/soc/f723d000.dwmmc0/by-name/system      /system             squashfs  ro                                                           wait
-/dev/block/platform/soc/f723d000.dwmmc0/by-name/cache       /cache              ext4      discard,noauto_da_alloc,data=ordered,user_xattr,barrier=1    wait
+/dev/block/platform/soc/f723d000.dwmmc0/by-name/cache       /cache              ext4      discard,noatime,noauto_da_alloc,data=ordered,user_xattr,barrier=1    wait
 /dev/block/platform/soc/f723d000.dwmmc0/by-name/userdata    /data               f2fs      discard,noatime,nosuid,nodev                                 wait,check,fileencryption=software,quota
-/dev/block/platform/soc/f723d000.dwmmc0/by-name/userdata    /data               ext4      discard,noauto_da_alloc,data=ordered,user_xattr,barrier=1    wait,formattable
+/dev/block/platform/soc/f723d000.dwmmc0/by-name/userdata    /data               ext4      discard,noatime,noauto_da_alloc,data=ordered,user_xattr,barrier=1    wait,formattable
 /devices/platform/soc/f723e000.dwmmc1/mmc_host/mmc*                   auto               auto      defaults  voldmanaged=sdcard1:auto,encryptable=userdata
 /devices/platform/soc/f72c0000.usb/usb*               auto               auto      defaults  voldmanaged=usbdisk:auto,encryptable=userdata