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 = {
diff --git a/board/bosch/shc/board.c b/board/bosch/shc/board.c
index 962a485..aebdfd4 100644
--- a/board/bosch/shc/board.c
+++ b/board/bosch/shc/board.c
@@ -115,7 +115,7 @@
 	gpio_direction_output(WIFI_REGEN_GPIO, 1);
 	/*
 	 * Wait for Wi-Fi power regulator to reach a stable voltage
-	 * (soft-start time, max. 350 µs)
+	 * (soft-start time, max. 350 us)
 	 */
 	__udelay(350);
 
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
 *