MAINTAINERS: add entry for the GISB arbiter driver

The GISB bus arbiter driver is relevant for BCM7xxx (brcmstb) platforms,
add an entry to cover this file.

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