rp2: Make rp2_state_machine_exec accept integers.

Currently rp2.StateMachine.exec(instr_in) requires that the instr_in
parameter be a string representing the PIO assembly language instruction
to be encoded by rp2.asm_pio_encode(). This commit allows the parameter
to also be of integral type. This is useful if the exec() method is
being called often where the use of pre-encoded machine code is
desireable.

This commit still supports calls like:
    sm.exec("set(0, 1)")

It also now supports calls like:
    # Performed once earlier, maybe in __init__()
    assembled_instr = rp2.asm_pio_encode("out(y, 8)", 0)
    # Performed multiple times later as the PIO state machine is
    # configured for its next run.
    sm.exec(assembled_instr)

The existing examples/rp2/pio_exec.py and examples/rp2/pio_pwm.py that
exercise the rp2.StateMachine.exec() method still work with this change.

Signed-off-by: Adam Green <adamgrym@yahoo.com>

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