MAINTAINERS: Add Lucas Stach as co-maintainer for i.MX6 PCI driver

Also drop Shawn Guo per his request.

Signed-off-by: Lucas Stach <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Acked-by: Richard Zhu <[email protected]>
Acked-by: Jingoo Han <[email protected]>
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