change Manager EthernetInterface's Hostname property's WriteReqmt to Supported

Signed-off-by: Leung <john.leung@intel.com>

Author: jcleung5549

HWMgmt/OCPBaselineHardwareManagement.v1_1_0.json

@@ -188,7 +188,7 @@
 					"ConditionalRequirements": [{
 						"SubordinateToResource": ["Manager", "EthernetInterfaceCollection"],
 						"ReadRequirement": "Mandatory",
-						"WriteRequirement": "Mandatory"
+						"WriteRequirement": "Supported"
 					}]
 				},
 				"FQDN": {