mx23evk: Do not set voltage selection bit for SSP pads

mx23 SSP pad registers do not contain voltage selection bit, so just remove it.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx23evk/spl_boot.c

@@ -25,7 +25,7 @@
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/sys_proto.h>
 
-#define	MUX_CONFIG_SSP1	(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP)
+#define	MUX_CONFIG_SSP1	(MXS_PAD_8MA | MXS_PAD_PULLUP)
 #define	MUX_CONFIG_EMI	(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_PULLUP)
 
 const iomux_cfg_t iomux_setup[] = {