event: Convert misc_init_f() to use events

This hook can be implmented using events, for the three boards that
actually use it.

Add the event type and event handlers. Drop CONFIG_MISC_INIT_F since we
can just use CONFIG_EVENT to control this. Since sandbox always enables
CONFIG_EVENT, we can drop the defconfig lines there too.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/event.c

@@ -30,6 +30,9 @@ const char *const type_name[] = {
 	"dm_post_probe",
 	"dm_pre_remove",
 	"dm_post_remove",
+
+	/* init hooks */
+	"misc_init_f",
 };
 
 _Static_assert(ARRAY_SIZE(type_name) == EVT_COUNT, "event type_name size");