imx: mx6ulevk: change QSPI PAD DSE to 120ohm

The current pad DSE for QSPI is 60ohm. This setting cause
too strong drive to clock and data signals. Need to change
the DSE to 120ohm for better signal quality.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c

@@ -303,7 +303,7 @@ static void setup_iomux_uart(void)
 
 #define QSPI_PAD_CTRL1	\
 	(PAD_CTL_SRE_FAST | PAD_CTL_SPEED_MED | \
-	 PAD_CTL_PKE | PAD_CTL_PUE | PAD_CTL_PUS_47K_UP | PAD_CTL_DSE_60ohm)
+	 PAD_CTL_PKE | PAD_CTL_PUE | PAD_CTL_PUS_47K_UP | PAD_CTL_DSE_120ohm)
 
 static iomux_v3_cfg_t const quadspi_pads[] = {
 	MX6_PAD_NAND_WP_B__QSPI_A_SCLK | MUX_PAD_CTRL(QSPI_PAD_CTRL1),