MAINTAINERS: Add Tegra Quad SPI driver section

Add maintainers and mailing list entries to Tegra Quad SPI driver
section.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Link: https://lore.kernel.org/r/1608585459-17250-4-git-send-email-skomatineni@nvidia.com


Signed-off-by: Mark Brown <broonie@kernel.org>