qcom: pil: Add properties required by the PIL modem driver

Add clock properties to list the references and names of
clocks that the modem subsystem accesses. These properties
are used by the clock and the pil-q6v5-mss drivers.

Change-Id: Ia29308be3649bf68583fd4a619f198a2d38dc085
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>