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>
diff --git a/common/board_f.c b/common/board_f.c
index e36bdbc..0ef34c7 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -818,6 +818,11 @@
 	return 0;
 }
 
+static int misc_init_f(void)
+{
+	return event_notify_null(EVT_MISC_INIT_F);
+}
+
 static const init_fnc_t init_sequence_f[] = {
 	setup_mon_len,
 #ifdef CONFIG_OF_CONTROL
@@ -877,9 +882,7 @@
 	show_board_info,
 #endif
 	INIT_FUNC_WATCHDOG_INIT
-#if defined(CONFIG_MISC_INIT_F)
 	misc_init_f,
-#endif
 	INIT_FUNC_WATCHDOG_RESET
 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
 	init_func_i2c,