MAINTAINERS: make my email address consistent

Use jiri@resnulli.us in all MAINTAINERS entries and fixup .mailmap
so all other addresses point to that one.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Link: https://lore.kernel.org/r/20230309114911.923460-1-jiri@resnulli.us


Signed-off-by: Jakub Kicinski <kuba@kernel.org>