board-find5:  Ifdef CMA stuff so we can disable it

Inspired by d2att board file
Remove requirements for secure allocation

d2 isn't using these, and they seem to be breaking us.

To quote FSR:
Fuck the MPAA
Fuck the RIAA
Fuck the suits and the BSA
And fuck em' all for the DMCA
config: Disable CMA

We fixed the boardfiles so we can kill this again