Revert "ANDROID: GKI: mm: add struct/enum fields for SPECULATIVE_PAGE_FAULTS"

This reverts commit b85526df.

Reason for revert: GKI does not support SPECULATIVE_PAGE_FAULTS until they are upstreamed.

Bug: 140544941
Change-Id: Ideeb6a11b8554618a20d736c3d8ca8b4ddcf6520
Test: build and compare ABI diffs
Signed-off-by: Suren Baghdasaryan <surenb@google.com>