VxWorks: Add some functions from vxCpuLib.h and taskLib.h

[biabbas]

Add functions

1. vxCpuConfiguredGet() set of CPU's configured in the system.
2. vxCpuEnabledGet() to get set of CPU's running in the system.
3. taskNameSet() to set name of any task.
4. taskNameGet() to get name of any task.

[rustbot]

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[biabbas]

r? @tgross35

[tgross35]

Tiny nit above but lgtm, @devnexen care to crosscheck this?

[devnexen]

LGTM

[tgross35]

Thanks devnexen. For the above nit:

@rustbot author

[biabbas]

@rustbot review

[tgross35]

Thanks!