armv7: Word-sized/half-word-sized memory operations for 32/16 bit read/write

Some registers only allow word-sized or half-word-sized operations and will
cause a data fault when accessed with byte-sized operations.
However, the compiler may or may not break such an operation into smaller
(byte-sized) chunks. Thus, we need to reliably perform word-sized operations for
32 bit read/write and half-word-sized operations for 16 bit read/write.

This is particularly the case on the rk3288 SRAM registers, where the watchdog
tombstone is stored. Moving to GCC 5.2.0 introduced a change of strategy in the
compiler, where a 32 bit read would be broken into byte-sized chunks, which
caused a data fault when accessing the watchdog tombstone register.

The definitions for byte-sized memory operations are also adapted to stay
consistent with the rest.

Change-Id: I1fb3fc139e0a813acf9d70f14386a9603c9f9ede
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: http://review.coreboot.org/11698
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

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