ARM: imx3: Remove unneeded #include <linux/pinctrl/machine.h>

Commit 6c5f05a6 ("ARM: imx3: Remove imx3 soc_init()")
removed the last user of the pinctrl machine API.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mm-imx3.c

@@ -12,7 +12,6 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of_address.h>
-#include <linux/pinctrl/machine.h>
 
 #include <asm/system_misc.h>
 #include <asm/hardware/cache-l2x0.h>