Add method for triggering Sanitize command

This patch adds a method to trigger Sanitize command to MMC.
The Sanitize command is used for deleting the unmapped memory region
of the MMC device.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Acked-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/mmc.c b/mmc.c
index a2de863..a757c8f 100644
--- a/mmc.c
+++ b/mmc.c
@@ -90,6 +90,11 @@
 		"Permanently disable the eMMC H/W Reset feature on <device>.\nNOTE!  This is a one-time programmable (unreversible) change.",
 	  NULL
 	},
+	{ do_sanitize, -1,
+	  "sanitize", "<device>\n"
+		"Send Sanitize command to the <device>.\nThis will delete the unmapped memory region of the device.",
+	  NULL
+	},
 	{ 0, 0, 0, 0 }
 };