Minor SD_MSS update

Author: fesch

libraries/SD_MMC/src/SD_MMC.cpp

@@ -42,8 +42,8 @@ bool SDMMCFS::begin(const char * mountpoint)
     //mount
     sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
     sdmmc_host_t host = SDMMC_HOST_DEFAULT();
-    host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
-    //host.flags = SDMMC_HOST_FLAG_1BIT; //use 1-line SD mode
+    host.max_freq_khz = SDMMC_FREQ_HIGHSPEED; //SDMMC_FREQ_PROBING; //SDMMC_FREQ_HIGHSPEED;
+    host.flags = SDMMC_HOST_FLAG_1BIT; //use 1-line SD mode
 
     esp_vfs_fat_sdmmc_mount_config_t mount_config = {
         .format_if_mount_failed = false,