rp2/machine_i2s: Deinit all active I2S instances on soft reset.

Add `machine_i2s_deinit_all` to teardown any active I2S instances on soft
reset.  Prior to this fix, code using I2S required a try/finally in order
to avoid a hard fault on soft reset.

Fixes issue #14339.
Signed-off-by: Phil Howard <phil@gadgetoid.com>

ports/rp2/machine_i2s.c

@@ -171,6 +171,15 @@ void machine_i2s_init0(void) {
     }
 }
 
+void machine_i2s_deinit_all(void) {
+    for (uint8_t i = 0; i < MAX_I2S_RP2; i++) {
+        machine_i2s_obj_t *i2s = MP_STATE_PORT(machine_i2s_obj[i]);
+        if (i2s) {
+            mp_machine_i2s_deinit(i2s);
+        }
+    }
+}
+
 static int8_t get_frame_mapping_index(int8_t bits, format_t format) {
     if (format == MONO) {
         if (bits == 16) {

ports/rp2/main.c

@@ -214,6 +214,7 @@ int main(int argc, char **argv) {
         #if MICROPY_PY_NETWORK
         mod_network_deinit();
         #endif
+        machine_i2s_deinit_all();
         rp2_dma_deinit();
         rp2_pio_deinit();
         #if MICROPY_PY_BLUETOOTH

ports/rp2/modmachine.h

@@ -6,6 +6,7 @@
 void machine_pin_init(void);
 void machine_pin_deinit(void);
 void machine_i2s_init0(void);
+void machine_i2s_deinit_all(void);
 void machine_pwm_deinit_all(void);
 
 struct _machine_spi_obj_t *spi_from_mp_obj(mp_obj_t o);