ufs: Implement cache management

Add function to flush and invalidate cache over request and response
queue entries, and perform flush and optional invalidate over block
layer data that are passed into the UFS layer. This makes it possible
to use UFS with caches enabled.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Tested-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>