mmc: sdhci-esdhc-imx: fix cpas over write issue

We should use '|=' instead '=', or it may over write the original
caps assigned before this line.
Signed-off-by: NDong Aisheng <b29396@freescale.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-esdhc-imx.c

@@ -1069,7 +1069,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 		break;
 
 	case ESDHC_CD_PERMANENT:
-		host->mmc->caps = MMC_CAP_NONREMOVABLE;
+		host->mmc->caps |= MMC_CAP_NONREMOVABLE;
 		break;
 
 	case ESDHC_CD_NONE: