Enhance checkpoint=disable GC threshold fallback mechanism

Enhanced the checkpoint=disable GC threshold fallback mechanism by first
dropping to checkpoint=disable before dropping the option completely for
kernel compatibility.

Test: atest vts_kernel_checkpoint_test
Bug: 193216993
Change-Id: I50ecdf3a82eb7bc677965e8fd3821227fd41bfc2
Signed-off-by: Jerry Wong <jerry.wong@broadcom.com>
1 file changed