ufs: ufs-qcom: Add support for presilicon configuration

The UFS phy during pre-silicon runs in HS-G1 and doesn't
support low-power modes.
It provides a method to disable-lpm and restrict
the gear to the desired value.

Change-Id: Iad7fae4aa4ed04546a761209d74107ad62d92ac7
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>