sh: use the common ascii hex helpers

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 8fdafc2..ce6ee92 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -184,15 +184,15 @@
 			int h, l;
 
 			c = *p++;
-			h = highhex(c);
-			l = lowhex(c);
+			h = hex_asc_hi(c);
+			l = hex_asc_lo(c);
 			put_char(port, h);
 			put_char(port, l);
 			checksum += h + l;
 		}
 		put_char(port, '#');
-		put_char(port, highhex(checksum));
-		put_char(port, lowhex(checksum));
+		put_char(port, hex_asc_hi(checksum));
+		put_char(port, hex_asc_lo(checksum));
 	    } while  (get_char(port) != '+');
 	} else
 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */