ARM: imx: (trivial) fix typo and grammar

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Joshua Clayton <stillcompiling@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/hardware.h

@@ -120,7 +120,7 @@
 	.type = _type,							\
 }
 
-/* There's a off-by-one betweem the gpio bank number and the gpiochip */
+/* There's an off-by-one between the gpio bank number and the gpiochip */
 /* range e.g. GPIO_1_5 is gpio 5 under linux */
 #define IMX_GPIO_NR(bank, nr)		(((bank) - 1) * 32 + (nr))