riscv: cpu: make riscv_cpu_probe to EVT_DM_POST_INIT_R callback

Since the Patch 55171aedda88, VisionFive2 booting has been broken [1].
VisionFive2 board requires to enable CONFIG_TIMER_EARLY but booting went
to panic from initr_dm_devices due to lack of a timer device.

- Error logs
initcall sequence 00000000fffd8d38 failed at call 00000000402185e4
(err=-19)

Thus, we need to move riscv_cpu_probe function in order to register
the timer earlier than initr_dm_devices.

Fixes: 7fe32b3442f0 ("event: Convert arch_cpu_init_dm() to use events")
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Tested-by: Milan P. Stanić <mps@arvanta.net>
Tested-by: Roland Ruckerbauer <mail@ruabmbua.dev>
Tested-by: Roland Ruckerbauer <mail@ruabmbua.dev>

arch/riscv/cpu/cpu.c

@@ -66,7 +66,7 @@ static inline bool supports_extension(char ext)
 #endif /* CONFIG_CPU */
 }
 
-static int riscv_cpu_probe(void)
+static int riscv_cpu_probe(void *ctx, struct event *event)
 {
 #ifdef CONFIG_CPU
 	int ret;
@@ -79,6 +79,7 @@ static int riscv_cpu_probe(void)
 
 	return 0;
 }
+EVENT_SPY(EVT_DM_POST_INIT_R, riscv_cpu_probe);
 
 /*
  * This is called on secondary harts just after the IPI is init'd. Currently
@@ -95,7 +96,7 @@ int riscv_cpu_setup(void *ctx, struct event *event)
 {
 	int ret;
 
-	ret = riscv_cpu_probe();
+	ret = riscv_cpu_probe(ctx, event);
 	if (ret)
 		return ret;
 
@@ -149,12 +150,6 @@ EVENT_SPY(EVT_DM_POST_INIT_F, riscv_cpu_setup);
 
 int arch_early_init_r(void)
 {
-	int ret;
-
-	ret = riscv_cpu_probe();
-	if (ret)
-		return ret;
-
 	if (IS_ENABLED(CONFIG_SYSRESET_SBI))
 		device_bind_driver(gd->dm_root, "sbi-sysreset",
 				   "sbi-sysreset", NULL);