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.

* tag 'reset-for-5.1' of git://git.pengutronix.de/git/pza/linux

:
  dt-bindings: reset: meson: add g12a bindings
  reset: imx7: Add support for i.MX8MQ IP block variant
  reset: imx7: Add plubming to support multiple IP variants
  reset: Add Broadcom STB SW_INIT reset controller driver
  dt-bindings: reset: Add document for Broadcom STB reset controller
  reset: socfpga: declare socfpga_reset_init in a header file
  reset: sunxi: declare sun6i_reset_init in a header file
  MAINTAINERS: use include/linux/reset for reset controller related headers
  dt-bindings: reset: imx7: Document usage on i.MX8MQ SoCs

Signed-off-by: Arnd Bergmann <arnd@arndb.de>