msm: clock-8974: Add clock to allow MSS to access memory

The MSS subsystem needs the gcc_mss_q6_bimc_axi_clk to be turned
on to allow the modem Q6 to access DDR. Add support for this
clock.

Change-Id: I2fe0d8740143d8f18eb5c8770bc4c4b07339c060
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>