Add BMC Flash dbus object to Palmetto

Add the BMC Flash dbus object to Palmetto.py to expose interfaces
to flash the BMC. Without it, there are no interfaces to flash BMC
from REST. This change is already in Barreleye, just porting to Palmetto.
diff --git a/bin/Palmetto.py b/bin/Palmetto.py
index 7172364..512a2ca 100755
--- a/bin/Palmetto.py
+++ b/bin/Palmetto.py
@@ -123,6 +123,12 @@
 		'monitor_process' : True,
 		'process_name'    : 'flash_bios.exe',
 	},
+	'bmc_flash_control' : {
+		'system_state'    : 'BMC_STARTING',
+		'start_process'   : True,
+		'monitor_process' : True,
+		'process_name'    : 'bmc_update.py',
+	},
 	'download_manager' : {
 		'system_state'    : 'BMC_STARTING',
 		'start_process'   : True,