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 Behún <kabel@kernel.org>
diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 43d7a8e..a485036 100644
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -89,7 +89,7 @@
 
 	/*
 	 * If in PCIe mode, alter DT
-	 * 0:Enable USB3.0,Disable PCIE, 1:Disable USB3.0, Enable PCIE
+	 * 0: Enable USB3.0, Disable PCIE, 1: Disable USB3.0, Enable PCIE
 	 */
 	if (ret > 0) {
 		static char data[32] __aligned(4);