Add RP2 PIO background read #15662

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10 errors

Build unexpectedmaker_pros3 for en_US took 111.76s and failed

Build unexpectedmaker_pros3 for de_DE took 2.47s and failed

Build unexpectedmaker_pros3 for en_GB took 2.30s and failed

Build unexpectedmaker_pros3 for en_x_pirate took 2.22s and failed

Build unexpectedmaker_pros3 for es took 2.41s and failed

Build unexpectedmaker_pros3 for fil took 2.37s and failed

Build unexpectedmaker_pros3 for fr took 2.49s and failed

Build unexpectedmaker_pros3 for ID took 2.36s and failed

Build unexpectedmaker_pros3 for it_IT took 2.31s and failed

Build unexpectedmaker_pros3 for ja took 2.19s and failed