soc/intel: Replace open-coded buffer length calculation

Use `sizeof(value)` instead of manually calculating the buffer size.

Change-Id: Ibe49e40b1c4f2c0b661d94e59059a95bdb204197
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52107
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/intel/cannonlake/gpio_common.c

@@ -14,11 +14,9 @@ void soc_gpio_pm_configuration(void)
 	const config_t *config = config_of_soc();
 
 	if (config->gpio_override_pm)
-		memcpy(value, config->gpio_pm, sizeof(uint8_t) *
-				TOTAL_GPIO_COMM);
+		memcpy(value, config->gpio_pm, sizeof(value));
 	else
-		memset(value, MISCCFG_GPIO_PM_CONFIG_BITS, sizeof(uint8_t) *
-				TOTAL_GPIO_COMM);
+		memset(value, MISCCFG_GPIO_PM_CONFIG_BITS, sizeof(value));
 
 	gpio_pm_configure(value, TOTAL_GPIO_COMM);
 }