Adapt CheckApfIsSupported for VSR-15 compatibility

This commit updates CheckApfIsSupported to align with VSR-15
requirements. APF should have minimum of 2000 bytes usable memory.

Bug: 303356901
Test: TH
(cherry picked from https://android-review.googlesource.com/q/commit:641f0aed53c80751a8f19e551c522d7c4671691f)
Merged-In: I2a2dbc22e1532fcb11ab256830cecba9f6c54446
Change-Id: I2a2dbc22e1532fcb11ab256830cecba9f6c54446