event: Add fpga load event

This enables implementing custom logic after a bitstream was loaded
into the fpga.

Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Link: https://lore.kernel.org/r/20230720072724.11516-1-christian.taedcke-oss@weidmueller.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/common/event.c b/common/event.c
index 164c95f..20720c5 100644
--- a/common/event.c
+++ b/common/event.c
@@ -36,6 +36,9 @@
 	/* init hooks */
 	"misc_init_f",
 
+	/* Fpga load hook */
+	"fpga_load",
+
 	/* fdt hooks */
 	"ft_fixup",