Reset controller changes for v5.1

This adds the include/linux/reset directory to MAINTAINERS for reset
specific headers and adds headers for sunxi and socfpga in there to
get rid of a few extern function declarations.
There is a new reset driver for the Broadcom STB reset controller and
the i.MX7 system reset controller driver is extended to support i.MX8MQ
as well. Finally, there is a new header with reset id constants for
the Meson G12A SoC, which has a reset controller identical to Meson AXG
and thus can reuse its driver and DT bindings.
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