Add MIDPLANE hardware component identity

[dplore]

Change Scope

• Add a MIDPLANE identity to the OPENCONFIG_HARDWARE_COMPONENT base identity.
• This change is backwards compatible.

Platform Implementations

• Nokia 7750 SR-e Service Router.

Its modular, mid-plane design offers MACsec line rate encryption, control plane, fan and power redundancy along with a NEBS-compliant front-to-back thermal design.

• Nokia 7950 Extensible Routing System.

The XCMs contain a slot-level control plane subsystem and fabric interface to interconnect to the SFMs via the chassis mid-plane.

• Cisco Nexus 7000 series

• Juniper MX960 midplane

[OpenConfigBot]

No major YANG version changes in commit ef6acc8

[gemini-code-assist]

Code Review

This pull request updates the openconfig-platform-types YANG module to version 1.12.0 and introduces a new MIDPLANE identity based on OPENCONFIG_HARDWARE_COMPONENT. The changes include a new revision entry and a detailed description for the midplane component. I have no feedback to provide.

[ghankins]

Implementation A: Nokia 7750 SR-e Service Router.

Its modular, mid-plane design offers MACsec line rate encryption, control plane, fan and power redundancy along with a NEBS-compliant front-to-back thermal design.

Implementation B: Nokia 7950 Extensible Routing System.

The XCMs contain a slot-level control plane subsystem and fabric interface to interconnect to the SFMs via the chassis mid-plane.

[ghankins]

You are missing a space between the first two words "Midplane is" in the first line of the description.

Midplaneis a central, passive, or active circuit board assembly situated...