event: Convert existing spy records to simple

Very few of the existing event-spy records use the arguments they are
passed. Update them to use a simple spy instead, to simplify the code.

Where an adaptor function is currently used, remove it where possible.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c
index f43b73a..5d8687b 100644
--- a/arch/arm/mach-imx/imx9/soc.c
+++ b/arch/arm/mach-imx/imx9/soc.c
@@ -552,7 +552,7 @@
 	return 0;
 }
 
-int imx9_probe_mu(void *ctx, struct event *event)
+int imx9_probe_mu(void)
 {
 	struct udevice *devp;
 	int node, ret;
@@ -576,7 +576,7 @@
 
 	return 0;
 }
-EVENT_SPY(EVT_DM_POST_INIT_F, imx9_probe_mu);
+EVENT_SPY_SIMPLE(EVT_DM_POST_INIT_F, imx9_probe_mu);
 
 int timer_init(void)
 {