src/mainboard to src/security: Fix spelling errors

These issues were found and fixed by codespell, a useful tool for
finding spelling errors.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Ie34003a9fdfe9f3b1b8ec0789aeca8b9435c9c79
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58081
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/google/gru/pwm_regulator.c b/src/mainboard/google/gru/pwm_regulator.c
index 5dddab5..3aafa9e 100644
--- a/src/mainboard/google/gru/pwm_regulator.c
+++ b/src/mainboard/google/gru/pwm_regulator.c
@@ -60,7 +60,7 @@
 void pwm_regulator_configure(enum pwm_regulator pwm, int millivolt)
 {
 	int duty_ns, voltage_max, voltage_min;
-	int voltage = millivolt * 10; /* for higer calculation accuracy */
+	int voltage = millivolt * 10; /* for higher calculation accuracy */
 	int pwm_number = pwm_enum_to_pwm_number[pwm];
 
 	voltage_min = pwm_design_voltage[pwm][0];