mfd: intel: Constify struct mfd_cell where possible

As of commit 03e361b25ee8dfb1fd9b890072c23c4aae01c6c7 ("mfd: Stop setting
refcounting pointers in original mfd_cell arrays"), the "cell" parameter of
mfd_add_devices() is "const" again. Hence make all cell data passed to
mfd_add_devices() const where possible.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/intel_msic.c

···
  * These devices appear only after the MSIC driver itself is initialized so
  * we can guarantee that the SCU IPC interface is ready.
  */
-static struct mfd_cell msic_other_devs[] = {
+static const struct mfd_cell msic_other_devs[] = {
 	/* Audio codec in the MSIC */
 	{
 		.id			= -1,