Revert "ath79: remove GPIO driver earlier registration hack"

This reverts commit f444dea428.

It seems that some devices using GPIO WDT have really short WDT timeouts
and when using module_platform_driver registration it happens too late
and thus WDT will timeout and reset the board.

So, for now lets return the postcore_initcall hack for now.

Fixes: f444dea428 ("ath79: remove GPIO driver earlier registration hack")
Signed-off-by: Joan Moreau <jom@grosjo.net>
Link: https://github.com/openwrt/openwrt/pull/16035
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/ath79/patches-6.6/340-register_gpio_driver_earlier.patch

@@ -0,0 +1,26 @@
+From: John Crispin <john@phrozen.org>
+Subject: ath79: Register GPIO driver earlier
+
+HACK: register the GPIO driver earlier to ensure that gpio_request calls
+from mach files succeed.
+
+Submitted-by: John Crispin <john@phrozen.org>
+---
+ drivers/gpio/gpio-ath79.c                     | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/gpio/gpio-ath79.c
++++ b/drivers/gpio/gpio-ath79.c
+@@ -300,7 +300,11 @@ static struct platform_driver ath79_gpio
+ 	.probe = ath79_gpio_probe,
+ };
+ 
+-module_platform_driver(ath79_gpio_driver);
++static int __init ath79_gpio_init(void)
++{
++	return platform_driver_register(&ath79_gpio_driver);
++}
++postcore_initcall(ath79_gpio_init);
+ 
+ MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X GPIO API support");
+ MODULE_LICENSE("GPL v2");