msm: clock-samarium: Change bimc_gpu type to dummy

gcc_bimc_gpu_clk is managed by RPM along with BIMC. There is no resource
id for bimc_gpu. Previously BIMC resource id was used. This results in
voting for lowest BIMC frequency during clock_late_init when bimc_gpu
is unprepared.

Remove the wrong RPM clock definition and replace it with a dummy clock
to preseve measurement ability.

Change-Id: Id0d6146c11bc122fa60e774c4d3fabaa798fc623
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>