defconfig: Enable BALANCE_ANON_FILE_RECLAIM for 8909, 8916

BALANCE_ANON_FILE_RECLAIM helps in improving headroom by
swapping anon memory earlier. This helps saving more memory
and helps overall system performance when ZRAM is enabled.
Enable this config for performance reasons.

Change-Id: I0ae056276d447d5a21a8c6abba12e04551931ce6
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>