linux-phytec-fsl

MAINTAINERS: update brcmstb entries

Add Gregory Fong and myself as maintainers for the brcmstb platform
along with Brian Norris and Marc Carino.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>