pinephone: rtc not working correctly

This causes fsck to check the entire file system on each boot:

 * Checking local filesystems  ...pmOS_root: Superblock last mount time is in the future.
        (by less than a day, probably due to the hardware clock being incorrectly set)
pmOS_root: Superblock last write time (Wed Dec 11 20:33:57 2019,
        now = Fri Aug 23 10:49:01 2019) is in the future.
FIXED.
pmOS_root: 72275/102816 files (0.1% non-contiguous), 806573/7774976 blocks     
pmOS_boot: Superblock last write time (Wed Dec 11 20:33:38 2019,
        now = Fri Aug 23 10:49:04 2019) is in the future.
FIXED.
pmOS_boot: 18/16384 files (16.7% non-contiguous), 48605/65536 blocks           
 [ ok ]