MAINTAINERS: Update Vikash Garodia's email address

MAINTAINERS: Update Vikash Garodia's email address

Replace my quicinc.com address with oss.qualcomm.com email in the
MAINTAINERS file for both IRIS and VENUS video accelerator drivers.
Also update mailmap to ensure proper attribution across historical
commits.

Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>