Remove the double free RTOS tests since this was never defined
behavior of CMSIS-RTOS. This allows testing to pass.
The RTX commit which caused this test to start failing is:
c3b123ef4256f65537e2597af475fc20ec9a383e
RTX5: updated MemoryPoolFree (removed count check) [SDCMSIS-801]
Note - Double freeing an element from a memory pool was never safe.
The error return value when double freeing was misleading since memory
corruption may still be occurring in that case. For more information
on this see SDCMSIS-801.
RAJKUMAR KANAGARAJ
Kevin Bracey
Russ Butler
Martin Kojtal
Przemyslaw Stekiel