libc: Use printf and snprintf across codebase

tf_printf and tf_snprintf are now called printf and snprintf, so the
code needs to be updated.

Change-Id: Iffeee97afcd6328c4c2d30830d4923b964682d71
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/drivers/marvell/comphy/phy-comphy-cp110.c b/drivers/marvell/comphy/phy-comphy-cp110.c
index 2b1770f..8b78280 100644
--- a/drivers/marvell/comphy/phy-comphy-cp110.c
+++ b/drivers/marvell/comphy/phy-comphy-cp110.c
@@ -18,7 +18,7 @@
 
 /* #define DEBUG_COMPHY */
 #ifdef DEBUG_COMPHY
-#define debug(format...) tf_printf(format)
+#define debug(format...) printf(format)
 #else
 #define debug(format, arg...)
 #endif