clk: qcom: apcs-msm8986: Include bitfield.h for FIELD_PREP

Otherwise some configurations fail.

Fixes: 02772636 ("clk: qcom: add the driver for the MSM8996 APCS clocks")
Link: https://lore.kernel.org/r/20230223013847.1218900-1-sboyd@kernel.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>