chore(pm_dfs): Fix whitespaces

This file did not have the three space indentation as specified by the
contributing guide [1]. Fix all cases of this.

[1] https://github.com/TexasInstruments/processor-sdk-doc/blob/master/CONTRIBUTING.md#indentation-and-whitespace

Signed-off-by: Kendall Willis <[email protected]>

Author: kwillis01