mmc: mmc_get_op_cond: Allow quiet detection of eMMC

Add a new 'quiet' argument to mmc_get_op_cond() function which avoids
printing error message when SD/eMMC card is not detected.

Espressobin and mx6cuboxi boards use this function for detecting presence
of eMMC and therefore it is expected and normal that eMMC does not have to
be connected. So error message "Card did not respond to voltage select!"
should be skipped in this case as it is not an error.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/include/mmc.h b/include/mmc.h
index 6f943e7..0bf19de 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -900,9 +900,10 @@
  * the presence of SD/eMMC when no card detect logic is available.
  *
  * @param mmc	Pointer to a MMC device struct
+ * @param quiet	Be quiet, do not print error messages when card is not detected.
  * @return 0 on success, <0 on error.
  */
-int mmc_get_op_cond(struct mmc *mmc);
+int mmc_get_op_cond(struct mmc *mmc, bool quiet);
 
 /**
  * Start device initialization and return immediately; it does not block on