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/siemens/capricorn/board.c b/board/siemens/capricorn/board.c
index 0d66a75..b1d7e3b 100644
--- a/board/siemens/capricorn/board.c
+++ b/board/siemens/capricorn/board.c
@@ -156,14 +156,14 @@
 	 *	0: internal clock
 	 *	1: external clock --->  your choice for RMII
 	 *
-	 * CLKDIV_SEL: it controls a div by 2 on the internal clock path à
-	 *	it should be don’t care when using external clock
+	 * CLKDIV_SEL: it controls a div by 2 on the internal clock path a
+	 *	it should be don't care when using external clock
 	 *	0: non-divided clock
 	 *	1: clock divided by 2
 	 * 50_DISABLE or 125_DISABLE:
-	 *	it’s used to disable the clock tree going outside the chip
+	 *	it's used to disable the clock tree going outside the chip
 	 *	when reference clock is generated internally.
-	 *	It should be don’t care when reference clock is provided
+	 *	It should be don't care when reference clock is provided
 	 *	externally.
 	 *	0: clock is enabled
 	 *	1: clock is disabled