Revert "Fix potential OOB write in btm_read_remote_ext_features_complete"

This reverts commit cfbbe062.

Reason for revert: reverting from release branches due to functional regressions in Auto.

Bug: 144205318
Change-Id: I80d7fb4f910e6c5c88668141e83ca48401151496
(cherry picked from commit 46cb1a02)