Add support for vxWorks 7

[ghost]

Is your feature request related to a problem? Please describe.
cFS traditionally has supported vxWorks 6. There are projects interested in using vxWorks 7 with cFS, so support must be added. This requires work in PSP and OSAL.

Describe the solution you'd like
An ideal solution is to support both vxWorks 6 and 7 with as little cloning of old vxWorks 6 as possible. On PSP, the current work is to copy mcp750-vxworks for the working platform. (5020) OSAL's goal is to have the vxworks osal support both 6 and 7.

Describe alternatives you've considered

Additional context

Requester Info
Steven Seeger / Embedded Flight Systmes, Inc. / GSFC Code 582