Switch over pinctrl debugfs files to use octal permissions as they are
preferred over symbolic permissions. Refer to commit f90774e1
("checkpatch: look for symbolic permissions and suggest octal instead").

Note: S_IFREG flag is added to the mode by __debugfs_create_file()
in fs/debugfs/inode.c
Suggested-by: NJoe Perches <joe@perches.com>
Suggested-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NDrew Fustini <drew@beagleboard.org>
Link: https://lore.kernel.org/r/20210302053059.1049035-2-drew@beagleboard.orgSigned-off-by: NLinus Walleij <linus.walleij@linaro.org>