msm: clock-8960: Add xo mapping for msm_xo driver

The msm_xo driver needs a mapping to the CXO clock so that it can
turn the buffer on and off via the clock API. The table for 8930
was added around the same time the the patch to move msm_xo to
the clock API was merged so this was missed. We replace the USB
mapping as well because the usb driver is voting on D0 via the
msm_xo interface and not the clock API.

Change-Id: I506a5e54448c994a64af763360b4c080b09b5708
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>