Merge pull request #332 from FrankBoesing/patch-3

some fixes (again) inputs i2s... sorry..

input_i2s.cpp

 			dest_left = &(left->data[offset]);
 			dest_right = &(right->data[offset]);
 			AudioInputI2S::block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
-			#if IMXRT_CACHE_ENABLED >=1
 			arm_dcache_delete(src, sizeof(i2s_rx_buffer) / 2);
-			#endif
 			do {
 				*dest_left++ = *src++;
 				*dest_right++ = *src++;

input_i2s2.cpp

 			dest_left = &(left->data[offset]);
 			dest_right = &(right->data[offset]);
 			AudioInputI2S2::block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
-			#if IMXRT_CACHE_ENABLED >=1
+
 			arm_dcache_delete(src, sizeof(i2s_rx_buffer) / 2);
-			#endif
+
 			do {
 				*dest_left++ = *src++;
 				*dest_right++ = *src++;

output_pwm.cpp

 extern const struct _pwm_pin_info_struct pwm_pin_info[];
 audio_block_t * AudioOutputPWM::block = NULL;
 DMAMEM __attribute__((aligned(32))) static uint16_t pwm_tx_buffer[2][AUDIO_BLOCK_SAMPLES * 2];
-DMAChannel AudioOutputPWM::dma[2](false);
+DMAChannel AudioOutputPWM::dma[2];
 _audio_info_flexpwm AudioOutputPWM::apins[2];
 
 FLASHMEM