Update PowerEdge_R740.yaml (#745)

adding the following updates:
1. power supply w/ max draw
2. device-bays:
3. iDRAC9
4. console-ports
5. console-server-ports:

device-types/Dell/PowerEdge_R740.yaml

@@ -4,27 +4,34 @@ model: PowerEdge R740
 slug: dell_poweredge_r740
 u_height: 2
 is_full_depth: true
+subdevice_role: parent
 console-ports:
-  - name: Serial
+  - name: Rear Serial
     type: de-9
-  - name: USB
-    type: usb-a
-  - name: VGA
+  - name: Front VGA
+    type: other
+  - name: Rear VGA
     type: other
 console-server-ports:
   - name: Front USB1
     type: usb-a
   - name: Front USB2
     type: usb-a
+  - name: Front Dedicated iDRAC direct USB
+    type: usb-a
   - name: Rear USB1
     type: usb-a
   - name: Rear USB2
     type: usb-a
+  - name: Rear Dedicated iDRAC direct USB
+    type: usb-a
 power-ports:
   - name: Power 1
     type: iec-60320-c14
+    maximum_draw: 750
   - name: Power 2
     type: iec-60320-c14
+    maximum_draw: 750
 interfaces:
   - name: Gig-E 1
     type: 1000base-t
@@ -34,6 +41,15 @@ interfaces:
     type: 1000base-t
   - name: Gig-E 4
     type: 1000base-t
-  - name: iDRAC
+  - name: iDRAC9
     type: 1000base-t
     mgmt_only: true
+device-bays:
+  - name: PCIe-Gen3 1
+  - name: PCIe-Gen3 2
+  - name: PCIe-Gen3 3
+  - name: Riser2 PCIe-Gen3 4
+  - name: Riser2 PCIe-Gen3 5
+  - name: Riser2 PCIe-Gen3 6
+  - name: Riser3 PCIe-Gen3 7
+  - name: Riser3 PCIe-Gen3 8