phy: qcom-ufs-qmp-v3: add ops to dump phy regs

It's useful to dump phy registers on failure to debug
link issues. Export a new ops for the ufs driver to invoke
during link failures.

Change-Id: Id3a9c9085375b783d97e7f2ffd3e11ec469aedb9
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>