Revert "chromium_org:armv6: REX routines are currently broken, use alternatives"

This reverts commit 639854ee6e51efc0f34b2981850b14c2eed0187f.

Change-Id: I51808a15deb1bb1ea08c3b8f154c073236477e4a
Merge "Revert "chromium_org:armv6: REX routines are currently broken, use alternatives"" into cm-11.0