libc: krait: Use performance version of memcpy.

Change-Id: I47d25d1da5b1a96bbc1b60f8acdaa31721a68e73
libc: krait: Use performance version of bcopy and memmove

Change-Id: I587085aeb0c30ceccaa3f420594a194b129632b5
libc: krait: Restore prior version of strcmp.

Change-Id: I8ddcdb4d3a905dd746985435dcdb525ab5a1c947