common: Convert *.c/h from UTF-8 to ASCII enconfing

Convert UTF-8 chars to ASCII in cases where make sense. No Copyright or
names are converted.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Marek BehĂșn <kabel@kernel.org>
diff --git a/board/bosch/shc/board.h b/board/bosch/shc/board.h
index 4cc02f9..a5e5818 100644
--- a/board/bosch/shc/board.h
+++ b/board/bosch/shc/board.h
@@ -154,7 +154,7 @@
 #define HDR_FATC_LEN	12
 
 /*
-* SHC parameters held in On-Board I²C EEPROM device.
+* SHC parameters held in On-Board I2C EEPROM device.
 *
 * Header Format
 *