ec/google/chromeec: Implement early power off support

This commit renames the `google_chromeec_do_early_poweroff()` function
to `platform_do_early_poweroff()`, aligning it with the API that adds
early power off support using the Chrome EC.

It selects the `HAVE_EARLY_POWEROFF_SUPPORT` Kconfig option for platform
to perform early power off procedures.

Change-Id: I0c634d69de36fe8bdb6a61c121e321d3626ac3ff
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86379
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/ec/google/chromeec/Kconfig

@@ -3,6 +3,7 @@
 config EC_GOOGLE_CHROMEEC
 	bool
 	select EC_SUPPORTS_DPTF_TEVT
+	select HAVE_EARLY_POWEROFF_SUPPORT
 	help
 	  Google's Chrome EC
 

src/ec/google/chromeec/ec.c

@@ -9,6 +9,7 @@
 #include <device/path.h>
 #include <elog.h>
 #include <halt.h>
+#include <reset.h>
 #include <rtc.h>
 #include <security/vboot/vboot_common.h>
 #include <stdlib.h>
@@ -1671,7 +1672,13 @@ bool google_chromeec_is_battery_present(void)
 	return false;
 }
 
-void google_chromeec_do_early_poweroff(void)
+/*
+ * Performs early power off.
+ *
+ * This function handles the necessary steps to initiate an early power off
+ * sequence.
+ */
+void platform_do_early_poweroff(void)
 {
 	google_chromeec_reboot(EC_REBOOT_COLD_AP_OFF, 0);
 	halt();

src/ec/google/chromeec/ec.h

@@ -471,14 +471,6 @@ bool google_chromeec_is_below_critical_threshold(void);
  */
 bool google_chromeec_is_battery_present(void);
 
-/*
- * Performs early power off.
- *
- * This function handles the necessary steps to initiate an early power off
- * sequence.
- */
-void google_chromeec_do_early_poweroff(void);
-
 /**
  * Determine if the UCSI stack is currently active.
  *