Drop legacy check_dynamic_partitions [2/2]

It's only required on legacy OTA client on Android 9 and earlier, which
"can't tell the difference between a retrofit OTA package and a regular
full OTA package", according to the AOSP docs.

Issue: FP3-A11#146
Change-Id: I2141a8623e760017a60f0e60609eea6c1a45aff6
2 files changed