[yang] Need Yang for KDUMP table

[ganglyu]

Description

We don't have Yang model for KDUMP table.

Steps to reproduce the issue:

1. Run 'config apply-patch' command
2. We can get below info:
   sonic_yang(6):Note: Below table(s) have no YANG models: CONSOLE_SWITCH, DEVICE_NEIGHBOR_METADATA, DHCP_SERVER, KDUMP, RESTAPI, SNMP, SNMP_COMMUNITY, TELEMETRY

Describe the results you received:

sonic_yang reports no Yang models.

Describe the results you expected:

sonic_yang reports ok.

Output of show version:

(paste your output here)

Output of show techsupport:

(paste your output here or download and attach the file here )

Additional information you deem important (e.g. issue happens only occasionally):

[zhangyanzhao]

@adyeung can BRCM help on this YANG table? Thanks.

[adyeung]

@ganglyu @zhangyanzhao BRCM will post PR, ETA mid May

[adyeung]

Changes posted to #10786

[zhangyanzhao]

YANG model PR is merged and close this issue.