ARM: omap2: fix missing include

commit d47529b2
"gpio: don't include module.h in shared driver header"
removed <linux/module.h> from the <linux/gpio/driver.h> header.

It seems arch/arm/mach-omap2/board-rx51-peripherals.c
is using __initdata_or_module from <linux/module.h> through
<linux/gpio.h> to <linux/gpio/driver.h>, so break this dependency
so that we get a clean compile.

Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Tony Lindgren <tony@atomide.com>
Fixes: d47529b2 ("gpio: don't include module.h in shared driver header")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-omap2/board-rx51-peripherals.c

@@ -29,6 +29,7 @@
 #include <linux/power/isp1704_charger.h>
 #include <linux/platform_data/spi-omap2-mcspi.h>
 #include <linux/platform_data/mtd-onenand-omap2.h>
+#include <linux/module.h>
 
 #include <plat/dmtimer.h>