mmc: core: Rename cmd_timeout_ms to busy_timeout

To better reflect that the cmd_timeout_ms is directly related to the
busy detection timeout, let's rename it.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 87079fc..b276996 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -95,7 +95,7 @@
  *              actively failing requests
  */
 
-	unsigned int		cmd_timeout_ms;	/* in milliseconds */
+	unsigned int		busy_timeout;	/* busy detect timeout in ms */
 	/* Set this flag only for blocking sanitize request */
 	bool			sanitize_busy;