mx23_olinuxino: Enable USB support

This enabled USB support for the mx23_olinuxino board.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/board/olimex/mx23_olinuxino/spl_boot.c b/board/olimex/mx23_olinuxino/spl_boot.c
index 3bbf5ad..a96c293 100644
--- a/board/olimex/mx23_olinuxino/spl_boot.c
+++ b/board/olimex/mx23_olinuxino/spl_boot.c
@@ -95,6 +95,10 @@
 	MX23_PAD_SSP1_DATA2__SSP1_DATA2 | MUX_CONFIG_SSP,
 	MX23_PAD_SSP1_DATA3__SSP1_DATA3 | MUX_CONFIG_SSP,
 	MX23_PAD_SSP1_SCK__SSP1_SCK | MUX_CONFIG_SSP,
+
+	/* Ethernet */
+	MX23_PAD_GPMI_ALE__GPIO_0_17 |
+		(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL),
 };
 
 void board_init_ll(void)