sst_memcpy32() only copied bytes/4 32bits, which means it dropped
the remaining bytes%4 bytes wrongly.

Here add copying those missing bytes, first to a 32bits tmp, and
then write the tmp to 32bits iomem.
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>