GHS: Update RTOS selection logic

Selection of an RTOS only needs to be performed if not set by user.

Avoid CMake developer warnings for setting GHS_OS_DIR multiple times.
Instead only set it once after searching has been performed.

Remove all the logic for printing error and status messages about RTOS
selection.  This was broken and reporting incorrect messages.  These
messages also breaks CMake tests.

NOTE: If RTOS selection fails then the compiler checks will result in
a build error.  The build error will report that the RTOS
"GHS_OS_DIR-NOT-SPECIFIED" does not exist.

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