Revert "mm, oom: check LMK enabled for pagefault_out_of_memory()"

This reverts commit 94c0e1ab.

We will not use in-kernel LMK any longer so do not
make divergent from upstream unnecessary.

Bug: 129765516
Change-Id: I2cb3d156de1305ba517e9544679634b2e7fe0fc5
Signed-off-by: Andrew Chant <achant@google.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>