nxos/base/drivers/avr: Suppress fallthrough warning.
This appears to be intentional since mode is set to AVR_RECV, so do not add a break statement.
Fixes:
base/drivers/avr.c: In function 'nx__avr_fast_update':
base/drivers/avr.c:305:8: error: this statement may fall through [-Werror=implicit-fallthrough=]
305 |     if (nx__twi_ready()) {
|        ^
base/drivers/avr.c:312:3: note: here
312 |   case AVR_RECV:
|   ^~~~
@@ -308,6 +308,7 @@ void nx__avr_fast_update(void) {
nx__twi_read_async(AVR_ADDRESS, raw_from_avr,
sizeof(raw_from_avr));
}
+ __attribute__((fallthrough));
case AVR_RECV:
/* If the transmission is complete, unpack the read data into the
