MAINTAINERS: Update James Hogan's email address

MAINTAINERS: Update James Hogan's email address

Update my imgtec.com email address to my kernel.org one in MAINTAINERS
as MIPS will soon no longer be part of Imagination Technologies, and add
a mapping in .mailcap so get_maintainer.pl reports the right address.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>
Cc: Laurent Vivier <laurent@vivier.eu>
Cc: qemu-devel@nongnu.org
Cc: qemu-trivial@nongnu.org
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
[Yongbok Kim:
  Updated message subject]
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>