Revert "mm: introduce CONFIG_SPECULATIVE_PAGE_FAULT"

This reverts commit f783633c.

Bug: 128240262
Change-Id: I2d5961521043932a767f828432f28e3418d7a77f
Signed-off-by: Minchan Kim <minchan@google.com>
[dereference23: Forward port to msm-5.4]
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>