mx51: Let USB Storage be built by default

Let USB Storage be built by default.

Also select NLS_ISO8859 so that the USB device can be mounted.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>

arch/arm/configs/mx51_defconfig

@@ -106,6 +106,7 @@ CONFIG_GPIO_SYSFS=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_MXC=y
+CONFIG_USB_STORAGE=y
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=m
 CONFIG_MMC_SDHCI=m
@@ -145,7 +146,7 @@ CONFIG_ROOT_NFS=y
 CONFIG_NLS_DEFAULT="cp437"
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y
-CONFIG_NLS_ISO8859_1=m
+CONFIG_NLS_ISO8859_1=y
 CONFIG_NLS_ISO8859_15=m
 CONFIG_NLS_UTF8=y
 CONFIG_MAGIC_SYSRQ=y