Revert "arm: atomic.h: defined relaxed atomic_read"

This reverts commit 1e0862f76180b6448c8f2e75f40a23ed546e1197.
Revert "arm: asm: relaxed.h: defined relaxed.h"

This reverts commit 451d253d0c4d83fd70f3a1c6fe53cc03d150efb7.