Add some missing pio functions

[peterharperuk]

Adds some 64 versions to work with rp2350b and more than 32 pins. Change cyw43 code to use the new function.

Fixes #1834

[kilograham]

merging this prior to some more PIO api cleanup I'm doing for > 32 pins, so it is possible it may change slightly

[lurch]

@kilograham When I do a full-build with arm-none-eabi-gcc it's complaining that:

...../pico-sdk/src/rp2_common/hardware_pio/pio.c: In function 'pio_sm_set_pins_with_mask64':
...../pico-sdk/src/rp2_common/hardware_pio/pio.c:259:41: error: conversion from 'uint64_t' {aka 'long long unsigned int'} to 'unsigned int' may change value [-Werror=conversion]
  259 |         uint base = (uint)__builtin_ctz(pin_mask);
      |                                         ^~~~~~~~
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

And indeed https://github.com/raspberrypi/pico-sdk/blob/develop/src/rp2_common/pico_platform_compiler/include/pico/platform/compiler.h#L63 says:

static inline uint __builtin_ctz(uint x) {

[kilograham]

yeah, thanks, i will fix this