clk: qcom: gcc: Cleanup code for GCC clocks

The fmax & num_fmax have been updated to reflect the new variable names and
also fall back to branch clocks clock_ops for hardware branch clocks for
now until the new ops are available.

Change-Id: I8b86ebbabe37bb86bd20eafe9501c4677f21a553
Signed-off-by: Taniya Das <tdas@codeaurora.org>