MLK-13440-2 mx6sllevk: Update USDHC2 parameter for using 1.8V I/O

Set the vs18_enable field to 1 for USDHC2 controller which connects to eMMC.
Also remove the explicit USDCH2 vendorspec register settings in board codes,
since the driver will take charge of it.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 03b2d94b)

board/freescale/mx6sllevk/mx6sllevk.c

@@ -170,7 +170,7 @@ static void setup_iomux_uart(void)
 #ifdef CONFIG_FSL_ESDHC
 static struct fsl_esdhc_cfg usdhc_cfg[CONFIG_SYS_FSL_USDHC_NUM] = {
 	{USDHC1_BASE_ADDR, 0, 8, 1},
-	{USDHC2_BASE_ADDR, 0, 8},
+	{USDHC2_BASE_ADDR, 0, 8, 0, 1}, /* fixed 1.8v IO voltage for eMMC chip */
 	{USDHC3_BASE_ADDR, 0, 4},
 };
 
@@ -210,7 +210,7 @@ int board_mmc_getcd(struct mmc *mmc)
 
 int board_mmc_init(bd_t *bis)
 {
-	int i, ret;
+	int i;
 
 	/*
 	 * According to the board_mmc_init() the following map is done:
@@ -230,10 +230,6 @@ int board_mmc_init(bd_t *bis)
 		case 1:
 			imx_iomux_v3_setup_multiple_pads(
 				usdhc2_pads, ARRAY_SIZE(usdhc2_pads));
-			/* eMMC connect to 1.8v, so need to set eMMC I/O voltage to 1.8v */
-			ret = readl(usdhc_cfg[1].esdhc_base + 0xc0);	/* vend_spec */
-			ret |= 0x2;
-			writel(ret, (usdhc_cfg[1].esdhc_base + 0xc0));
 			usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
 			gpio_direction_output(USDHC2_PWR_GPIO, 1);
 			break;