phy: freescale: imx8qm-hsio: Include bitfield.h for FIELD_PREP

In various configurations/architectures, bitfield.h may not be
transitively included, which results in a compiler error because
FIELD_PREP is an unexpanded macro:

  drivers/phy/freescale/phy-fsl-imx8qm-hsio.c:459:8: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    459 |         val = FIELD_PREP(HSIO_MODE_MASK, val);
        |               ^
  1 error generated.

Include bitfield.h explicitly to fix the build.

Fixes: 82c56b6 ("phy: freescale: imx8qm-hsio: Add i.MX8QM HSIO PHY driver support")
Signed-off-by: Nathan Chancellor <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Reviewed-by: Frank Li <[email protected]>
Link: https://lore.kernel.org/r/20240620-phy-fsl-imx8qm-hsio-add-bitfield-include-v1-1-5c7c09ed87e6@kernel.org
Signed-off-by: Vinod Koul <[email protected]>

Author: nathanchance

drivers/phy/freescale/phy-fsl-imx8qm-hsio.c

@@ -3,6 +3,7 @@
  * Copyright 2024 NXP
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>