Revert "kexec-hardboot: based on @Tasssadar https://github.com/Tasssadar/android_kernel_google_msm/commit/005cf387c1404eac862cc35153d7641d18faef4c"

This reverts commit 2fbd2686a5aaf2cded9f33176eb2a8637bc71912.
ARM: mm: remove more kernel writing