m4: Give camera blobs access to memory info

Sense 6 blobs want to read /proc/vmallocinfo and debugfs:ion/mm, but
they expect debugfs mounted at /data/d.

Change-Id: Ie3e44719a926496963810cd4154172d97838c41b
m4: Fix deprecated fstab syntax

Change-Id: I4c6bf2237245ce24378a5ca8748796810a4c9115
Revert "m4: add TARGET_DISPLAY_INSECURE_MM_HEAP"

This reverts commit 262b41bb3fb667a69ef182d57bd15a85e35f0bfc.

Change-Id: I9797db883c48a90e5b269c0ca00d688727d98c50
m4: Remove stale keylayout annotations

Change-Id: Ia818050f4e1ba1996e08899ef98f3b391d5f3ce9