Turn on frequencyio only on CIRCUITPY_FULL_BUILD

[dhalbert]

frequencyio is too large to fit on some small builds due to language string size. Turn it off for small builds.

[sommersoft]

@dhalbert just to note, I went with explicit CIRCUITPY_FREQUENCYIO = 0 so that SAMD21 wouldn't include it (I did miss setting it in CatWAN). I still need to go back and test the SAMD21 code that is left in FrequencyIn as an optional build. But, if a future SAMD21 port doesn't explicitly exclude frequencyio, and uses the full build, it will be included.

[dhalbert]

I can turn it off explicitly in all SAMD21 builds now. I can add a new commit to this PR. Does that make sense?

[dhalbert]

I would make the changes in mpconfigport.mk and check for SAMD21.

[sommersoft]

I would make the changes in mpconfigport.mk and check for SAMD21.

why didn't I think of that. haha

[dhalbert]

CIRCUITPY_FREQUENCYIO = 0 is left in on on samd21 mpconfigboard.mk files because those builds need it off no matter what, for space reasons, even it becomes usable on samd21.

[dhalbert]

@sommersoft @tannewt this has now passed travis too.

[tannewt]

Thanks again!