Fix CPBlue LFCLKSRC; CPB has no status neopixel

[dhalbert]

• Circuit Playground Bluefruit does not have a 32kHz crystal on board. This is quite unusual, and the nRF clock code assumed there would be one. Caused BLE failures and other timing-related issues.
• There is not a status neopixel on this board, as with CPX: first neopixel was getting reset with status colors.
• Fixed typo in an unrelated error string.

Thanks @ladyada and @hathach.

[dhalbert]

@bmeisels and @jepler Apologies: I encountered exactly the same issue with the Circuit Playground Bluefruit and didn't realize there was a PR approved 9 hours beforehand. I wrote essentially the same PR, but with just #if and no inline routine. This is more the style we use now. Also fixed a couple of other things at the same time.

[dhalbert]

Added some #pragma message () temporarily to check that the correct #if BOARD_HAS_32KHZ_CRYSTAL conditional arms were being used.

I should not try to complete a PR after midnight.

[hathach]

all good