dt-bindings: clock: Update clock ids of GCC for SHIMA

Add clock id for GCC PCIE throttle core clock and remove clock ids of few
dummy clocks on SHIMA.

Change-Id: I71d41fc078c1b9d9d89dbc6b44e1296fe6b3c9ed
Signed-off-by: Jagadeesh Kona <jkona@codeaurora.org>