event: Add a command

Add a command to show the available events.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index d10deed..1ed63fa 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2367,6 +2367,14 @@
 	  available tests and running either all the tests, or specific tests
 	  identified by name.
 
+config CMD_EVENT
+	bool "event - Show information about events"
+	default y if EVENT_DEBUG
+	help
+	  This enables the 'event' command which provides information about
+	  events and event-handler routines. This can help to device event
+	  hadling.
+
 config CMD_IRQ
 	bool "irq - Show information about interrupts"
 	depends on !ARM && !MIPS && !RISCV && !SH