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/x86/cpu/broadwell/cpu.c b/arch/x86/cpu/broadwell/cpu.c
index f30aebf..560b1f7 100644
--- a/arch/x86/cpu/broadwell/cpu.c
+++ b/arch/x86/cpu/broadwell/cpu.c
@@ -25,7 +25,7 @@
 #include <asm/arch/pch.h>
 #include <asm/arch/rcb.h>
 
-static int broadwell_init_cpu(void *ctx, struct event *event)
+static int broadwell_init_cpu(void)
 {
 	struct udevice *dev;
 	int ret;
@@ -40,7 +40,7 @@
 
 	return 0;
 }
-EVENT_SPY(EVT_DM_POST_INIT_F, broadwell_init_cpu);
+EVENT_SPY_SIMPLE(EVT_DM_POST_INIT_F, broadwell_init_cpu);
 
 void set_max_freq(void)
 {