vidc: Stop using vcodec_axi_a_clk and vcodec_axi_b_clk directly

These two clock are now implicityly enabled and disabled as
dependencies of vcodec_clk (as was already the case for
vcodec_axi_clk).

Signed-off-by: Matt Wagantall <mattw@codeaurora.org>

Conflicts:

	drivers/video/msm/vidc/1080p/resource_tracker/vcd_res_tracker.c