event: Convert arch_cpu_init_dm() to use events

Instead of a special function, send an event after driver model is inited
and adjust the boards which use this function.

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

common/board_f.c

@@ -803,11 +803,6 @@ __weak int reserve_arch(void)
 	return 0;
 }
 
-__weak int arch_cpu_init_dm(void)
-{
-	return 0;
-}
-
 __weak int checkcpu(void)
 {
 	return 0;
@@ -848,7 +843,6 @@ static const init_fnc_t init_sequence_f[] = {
 	arch_cpu_init,		/* basic arch cpu dependent setup */
 	mach_cpu_init,		/* SoC/machine dependent CPU setup */
 	initf_dm,
-	arch_cpu_init_dm,
 #if defined(CONFIG_BOARD_EARLY_INIT_F)
 	board_early_init_f,
 #endif