Upgrade PRODUCT_SHIPPING_API_LEVEL to 31 (Android S)

PRODUCT_SHIPPING_API_LEVEL: 31
Target FCM version: 5
Kernel FCM version: 6

TO-DO: Upgrade "Target FCM version" from 5 to 6
       "Target FCM version" must be 6 if PRODUCT_SHIPPING_API_LEVEL is 31.

Bug: 167997902
Bug: 186723740
Bug: 184801854
Bug: 186500818
Test: The device can boot to home.
      $ adb shell getprop ro.product.first_api_level
        [ro.product.first_api_level]: [31]
      $ adb shell ls /sys/kernel/debug
      $ adb root && adb shell getprop ro.product.debugfs_restrictions.enabled
Change-Id: I79a9d3835b9d3c508e647c1bbf53bd1c1465de05
Signed-off-by: Aaron Ding <aaronding@google.com>
1 file changed