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/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c b/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
index 2f1731e..d7f4795 100644
--- a/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
+++ b/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
@@ -110,14 +110,14 @@
 	return 0;
 }
 
-static int pg_wcom_misc_init_f(void *ctx, struct event *event)
+static int pg_wcom_misc_init_f(void)
 {
 	if (IS_ENABLED(CONFIG_PG_WCOM_UBOOT_UPDATE_SUPPORTED))
 		check_for_uboot_update();
 
 	return 0;
 }
-EVENT_SPY(EVT_MISC_INIT_F, pg_wcom_misc_init_f);
+EVENT_SPY_SIMPLE(EVT_MISC_INIT_F, pg_wcom_misc_init_f);
 
 int board_init(void)
 {