serial: Fix a typo ("ignorning")

Fix the two instances of this typo present in the MSM and VT8500 serial
drivers.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Acked-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20221104103719.2234098-1-j.neuschaefer@gmx.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>