Revert "Move e2fsck into /first_stage_ramdisk."

This reverts commit 3337e782.

Reason for revert: e2fsck is moved into vendor ramdisk and installed
to / or /first_stage_ramdisk depending on the device, so there is no
need to move it.

Bug: 173425293
Change-Id: I1eb431e6b2a1e0ba7d0da0278d076b6682a0156d
Test: boots