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

Otherwise some configurations fail.

Fixes: 0277263 ("clk: qcom: add the driver for the MSM8996 APCS clocks")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

Author: bebarino

drivers/clk/qcom/apcs-msm8996.c

@@ -7,6 +7,7 @@
  */
 
 #include <linux/bits.h>
+#include <linux/bitfield.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/module.h>