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/acc/acc.c b/board/bosch/acc/acc.c
index 34088ad..65c2f35 100644
--- a/board/bosch/acc/acc.c
+++ b/board/bosch/acc/acc.c
@@ -437,7 +437,7 @@
 	.trcd = 1313, // 13.125ns
 	.trcmin = 5063, // 50.625ns
 	.trasmin = 3750, // 37.5ns
-	.SRT = 0, // Set to 1 for temperatures above 85°C
+	.SRT = 0, // Set to 1 for temperatures above 85 deg C
 };
 
 static const struct mx6_ddr_sysinfo acc_mx6d_ddr_info = {