msm: clock-8084: Add UFS host phy reference clock support

Reference clock is propogated in a daisy-chained manner from source
to UFS phy with mutliple clock buffers buffering the clock output
at each stage. These buffers are powered by integrated LDO's which
are enabled by writing into *_LDO_EN registers.

The client drivers are expected to follow the dependency chain and
enable all of clocks to make sure the source ref clock reaches the
destination phy.

Change-Id: Ifb03a769c99011298741a664242e83d7a0b26677
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>