Add Nokia 7220 IXR D4 and D5 device types (#1570)

device-types/Nokia/7220-IXR-D4-28-100GE.yaml

device-types/Nokia/7220-IXR-D5-32-400GE.yaml

elevation-images/Nokia/nokia-7220-ixr-d4-28-100ge.front.png

elevation-images/Nokia/nokia-7220-ixr-d4-28-100ge.rear.png

elevation-images/Nokia/nokia-7220-ixr-d5-32-400ge.front.png

elevation-images/Nokia/nokia-7220-ixr-d5-32-400ge.rear.png

module-types/Nokia/FAN-7220-IXR-D4-B2F.yaml

module-types/Nokia/FAN-7220-IXR-D4-F2B.yaml

module-types/Nokia/FAN-7220-IXR-D5-B2F.yaml

module-types/Nokia/FAN-7220-IXR-D5-F2B.yaml

module-types/Nokia/PS-7220-IXR-D4-AC-B2F.yaml

module-types/Nokia/PS-7220-IXR-D4-AC-F2B.yaml

module-types/Nokia/PS-7220-IXR-D4-DC-B2F.yaml

module-types/Nokia/PS-7220-IXR-D4-DC-F2B.yaml

module-types/Nokia/PS-7220-IXR-D5-AC-B2F.yaml

module-types/Nokia/PS-7220-IXR-D5-AC-F2B.yaml

module-types/Nokia/PS-7220-IXR-D5-DC-B2F.yaml

module-types/Nokia/PS-7220-IXR-D5-DC-F2B.yaml