plat: marvell: mci: use more meaningful name for mci link tuning

The mci_initialize function name was misleading. The function itself
doesn't initialize MCI in general but performs MCI link tuning for
performance improvement.

Change-Id: I13094ad2235182a14984035bbe58013ebde84a7e
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
diff --git a/drivers/marvell/mci.c b/drivers/marvell/mci.c
index 06fe88e..bd62a30 100644
--- a/drivers/marvell/mci.c
+++ b/drivers/marvell/mci.c
@@ -819,7 +819,7 @@
 }
 
 /* Initialize MCI for performance improvements */
-int mci_initialize(int mci_index)
+int mci_link_tune(int mci_index)
 {
 	int ret;