Revert "mmc: Added CRC toggle support for Spreadtrum platform"

This reverts commit 4f7cf9f.

drivers/mmc/core/core-sprd.c

@@ -67,24 +67,9 @@ static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
  * Enabling software CRCs on the data blocks can be a significant (30%)
  * performance cost, and for other reasons may not always be desired.
  * So we allow it it to be disabled.
- *
- * SysFs interface :
- *
- * /sys/module/mmc_core/parameters/crc
- *
- * Enable / Disable CRC
- *
- * echo N > /sys/module/mmc_core/parameters/crc (Disabled) or
- * echo 0 > /sys/module/mmc_core/parameters/crc (Disabled)
- *
- * echo Y > /sys/module/mmc_core/parameters/crc (Enabled) or
- * echo 1 > /sys/module/mmc_core/parameters/crc (Enabled)
-*/
-
-int use_spi_crc = 0;
-EXPORT_SYMBOL(use_spi_crc);
-module_param_named(crc, use_spi_crc, int, 0644);
-MODULE_PARM_DESC(crc, "Enable/disable CRC");
+ */
+bool use_spi_crc = 1;
+module_param(use_spi_crc, bool, 0);
 
 /*
  * We normally treat cards as removed during suspend if they are not