MAINTAINERS: Update maintainers for broadcom USB

Al Cooper is no longer the internal broadcom maintainer for broadcom
USB. I will be taking his place as the internal maintainer and as an
additional upstream maintainer.

Signed-off-by: Justin Chen <justinpopo6@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/1665167529-9840-1-git-send-email-justinpopo6@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>