Revert "Define FLAG_MUTABLE and add a compat change for explicit..."

Revert "Add a check for FLAG_MUTABLE and FLAG_IMMUTABLE being se..."

Revert submission 12627798-define-flag-mutable

Reason for revert: Makes wembley device unusable by killing UI, also kills Bluetooth repeatedly

Bug: 169241864, 169239341
Test: Locally reverted and wembley now has UI and no Bluetooth crashing messages
Reverted Changes:
I2ffbc6859:Add a check for FLAG_MUTABLE and FLAG_IMMUTABLE be...
I1f1f72c6c:Define FLAG_MUTABLE and add a compat change for ex...

Change-Id: I0b1f0eadce97a1f7bbd17768f5ee491b3871b10f