clk: msm: clock-gcc-8996: Add always_on flag to bimc clocks

Due to hardware limitations which do not allow the
gcc_mss_q6_bimc_axi_clk and gcc_bimc_gfx_clk clocks
to be turned off, place an always_on vote on these
clocks from the HLOS.

Change-Id: I18368b2b6faa4c61484369ecb7e9000353fab53b
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>