drm/bridge: Fix spelling mistake "gettin" -> "getting"

There is a spelling mistake in a dev_err message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Fixes: ff578163 ("drm/bridge: sii902x: Implement HDMI audio support")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250228083248.676473-1-colin.i.king@gmail.com