ARM: OMAP2+: Remove unneeded #include <linux/pinctrl/machine.h>

Commit 6f3ab009 ("ARM: OMAP2+: Remove unused legacy code for
device init") removed the last user of the pinctrl machine API.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Message-Id: <5dd5e235af9b3def7f4a431edc7bb8504b0681bf.1668001020.git.geert+renesas@glider.be>
Signed-off-by: Tony Lindgren <tony@atomide.com>