Revert "arm: Allow CPU-supported unaligned accesses"

This reverts commit 5f5b09c8d460f9e32e46650a99a34a63acc80b1e.
Revert "arch/kconfig: enable HAVE_EFFICIENT_UNALIGNED_ACCESS"

This reverts commit f2795c7b22bd1ae9fc03c7a739b3bf790afaff87.
Revert "ARM: kconfig: select HAVE_EFFICIENT_UNALIGNED_ACCESS for CPUv6+ && MMU"

This reverts commit 7412c9bcbd75f6e6343d740096831af3d52fa387.
defconfig