ufs: split flush and invalidate to only invalidate when required

ufs: split flush and invalidate to only invalidate when required

There is no need to flush and invalidate all data updated by the
driver, mainly because on ARM platforms flush also invalidates
the cachelines.

Split the function in two and add the appropriate cacheline
invalidates after the UFS DMA operation finishes to make sure
we read from memory.

Flushing then invalidating cacheline unaligned data causes data
corruption issues on Qualcomm platforms, and is largely unnecessary
anyway, so let's cleanup the cache operations.

Reviewed-by: Neha Malcom Francis <[email protected]>
Tested-by: Venkatesh Yadav Abbarapu <[email protected]>
Tested-by: Julius Lehmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>