gcc_bimc_gfx_clk is a required clock for booting the GPU and GPU SMMU.

Fixes: 4807c71c (arm64: dts: Add msm8998 SoC and MTP board support)
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191217164913.4783-1-jeffrey.l.hugo@gmail.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>