Added images and adjusted device-types (#2450)

Co-authored-by: fknorn <fknorn@cisco.com>

device-types/Cisco/FPR4112-NGFW-K9.yaml

@@ -5,6 +5,8 @@ slug: cisco-fpr4112-ngfw-k9
 part_number: FPR4112-NGFW-K9
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Firepower 4100 Series Data Sheet](https://www.cisco.com/c/en/us/products/collateral/security/firepower-4100-series/datasheet-c78-742474.html)'
 console-ports:
   - name: Console

device-types/Cisco/FPR4115-NGFW-K9.yaml

@@ -5,6 +5,8 @@ slug: cisco-fpr4115-ngfw-k9
 part_number: FPR4115-NGFW-K9
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Firepower 4100 Series Data Sheet](https://www.cisco.com/c/en/us/products/collateral/security/firepower-4100-series/datasheet-c78-742474.html)'
 console-ports:
   - name: Console

device-types/Cisco/FPR4125-NGFW-K9.yaml

@@ -5,6 +5,8 @@ slug: cisco-fpr4125-ngfw-k9
 part_number: FPR4125-NGFW-K9
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Firepower 4100 Series Data Sheet](https://www.cisco.com/c/en/us/products/collateral/security/firepower-4100-series/datasheet-c78-742474.html)'
 console-ports:
   - name: Console

device-types/Cisco/FPR4145-NGFW-K9.yaml

@@ -5,6 +5,8 @@ slug: cisco-fpr4145-ngfw-k9
 part_number: FPR4145-NGFW-K9
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Firepower 4100 Series Data Sheet](https://www.cisco.com/c/en/us/products/collateral/security/firepower-4100-series/datasheet-c78-742474.html)'
 console-ports:
   - name: Console