Revert "[res] Optimize Idmap verification - use mtime as crc"

This reverts commit 1ebcbc67.

This is a partial revert; the aconfig flag definition for `android.content.res.idmap_crc_is_mtime` and `*.bp` changes are kept

Reason for revert: framework-res.apk idmaps don't get regenerated when they should be, since mtime is normalized to the same timestamp across Pixel builds

Bug: b/433857121
Bug: b/422474410
Change-Id: I4c5c6abe08a135468d9ac25d44d6ea5b474131af