thermal: core: Move initialization after core initcall

The generic netlink is initialized at subsys_initcall, so far after
the thermal init routine and the thermal generic netlink family
initialization.

On ŝome platforms, that leads to a memory corruption.

The fix was sent to netdev@ to move the genetlink framework
initialization at core_initcall.

Move the thermal core initialization to postcore level which is very
close to core level.

Reported-by: Marek Szyprowski <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Reviewed-by: Amit Kucheria <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

drivers/thermal/thermal_core.c

@@ -1676,4 +1676,4 @@ static int __init thermal_init(void)
 	mutex_destroy(&poweroff_lock);
 	return result;
 }
-core_initcall(thermal_init);
+postcore_initcall(thermal_init);