Switch to TI compiler + UMM malloc for CC3200

Frees up ~19KB RAM:

Before:
  Code size: 210616
  RAM at startup: 48636 total, 34472 free
  RAM after sys init: 15024 free

After:
  Code size: 195784
  RAM at startup: 65096 total, 52980 free
  RAM after sys init: 34116 free

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