ASoC: meson: axg-fifo: report interrupt request failure

Return value of request_irq() was irgnored. Fix this and report
the failure if any

Fixes: 6dc4fa17 ("ASoC: meson: add axg fifo base driver")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>