sh: mach-highlander: Add missing #include <mach/highlander.h>

arch/sh/boards/mach-highlander/pinmux-r7785rp.c:9:13: warning: no previous prototype for ‘highlander_plat_pinmux_setup’ [-Wmissing-prototypes]

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: John Paul Adrian Glaubitz <[e-mail]>
Link: https://lore.kernel.org/r/bbbc8[e-mail]
Signed-off-by: John Paul Adrian Glaubitz <[e-mail]>

arch/sh/boards/mach-highlander/pinmux-r7785rp.c

···
 #include <linux/init.h>
 #include <linux/gpio.h>
 #include <cpu/sh7785.h>
+#include <mach/highlander.h>
 
 void __init highlander_plat_pinmux_setup(void)
 {