mboxd: Mark the protocol as reset on shutdown

This is necessary for the host firmware to properly recover from a
daemon restart event, as it needs to re-perform the GET_INFO handshake
and re-establish any window it had active prior to the daemon
restarting.

While we're here, rename the symbol to align with the documentation.

Change-Id: I628d2ee5972177b7ad78392a86122d16104e7011
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd.h b/mboxd.h
index 8fd3183..1047e46 100644
--- a/mboxd.h
+++ b/mboxd.h
@@ -30,14 +30,14 @@
 #define FLAGS_SHORT_LIFETIME		0x01
 
 /* BMC Event Notification */
-#define BMC_EVENT_REBOOT		0x01
+#define BMC_EVENT_PROTOCOL_RESET	0x01
 #define BMC_EVENT_WINDOW_RESET		0x02
-#define BMC_EVENT_ACK_MASK		(BMC_EVENT_REBOOT | \
+#define BMC_EVENT_ACK_MASK		(BMC_EVENT_PROTOCOL_RESET | \
 					BMC_EVENT_WINDOW_RESET)
 #define BMC_EVENT_FLASH_CTRL_LOST	0x40
 #define BMC_EVENT_DAEMON_READY		0x80
-#define BMC_EVENT_V1_MASK		BMC_EVENT_REBOOT
-#define BMC_EVENT_V2_MASK		(BMC_EVENT_REBOOT | \
+#define BMC_EVENT_V1_MASK		BMC_EVENT_PROTOCOL_RESET
+#define BMC_EVENT_V2_MASK		(BMC_EVENT_PROTOCOL_RESET | \
 					BMC_EVENT_WINDOW_RESET | \
 					BMC_EVENT_FLASH_CTRL_LOST | \
 					BMC_EVENT_DAEMON_READY)