ARM: bcm2835: Fix grammar in help message

Replace "is use" by "is used" and remove a comma.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-bcm2835/Kconfig

@@ -12,4 +12,4 @@ config ARCH_BCM2835
 	select PINCTRL_BCM2835
 	help
 	  This enables support for the Broadcom BCM2835 SoC. This SoC is
-	  use in the Raspberry Pi, and Roku 2 devices.
+	  used in the Raspberry Pi and Roku 2 devices.