Remove non-ascii & unprintable characters

These non-ascii & unprintable characters aren't needed.

Change-Id: I129f729f66d6a692de729d76971f7deb7a19c254
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/15977
Tested-by: build bot (Jenkins)
Reviewed-by: Omar Pakker
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/siemens/sitemp_g1p1/mainboard.c b/src/mainboard/siemens/sitemp_g1p1/mainboard.c
index f01420f..41811e4 100644
--- a/src/mainboard/siemens/sitemp_g1p1/mainboard.c
+++ b/src/mainboard/siemens/sitemp_g1p1/mainboard.c
@@ -49,7 +49,7 @@
 #define PANEL_TABLE_ID8 	8 // 1280x1024_108MHz
 #define PANEL_TABLE_ID9 	9 // 1366x768_86MHz_chimei_V32B1L01
 
-// Callback Sub-Function 05h – Select Boot-up TV Standard
+// Callback Sub-Function 05h - Select Boot-up TV Standard
 #define TV_MODE_00	0x00	/* NTSC */
 #define TV_MODE_01	0x01	/* PAL */
 #define TV_MODE_02	0x02	/* PALM */