Create rack-workstation-4u-1psu.yaml (#2905)

Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/Generic/rack-workstation-4u-1psu.yaml

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+---
+manufacturer: Generic
+model: rack-workstation-4u-1psu
+slug: generic-rack-workstation-4u-1psu
+u_height: 4
+is_full_depth: false
+airflow: front-to-rear
+comments: Generic 4u rack workstation
+weight: 12
+weight_unit: kg
+power-ports:
+  - name: PSU
+    type: iec-60320-c14
+    maximum_draw: 650
+    allocated_draw: 300
+interfaces:
+  - name: BMC
+    type: 1000base-t
+    mgmt_only: true
+    description: Dedicated IPMI LAN port
+  - name: Eth1
+    type: 1000base-t
+  - name: Eth2
+    type: 1000base-t
+  - name: Eth3
+    type: 1000base-t
+  - name: Eth4
+    type: 1000base-t