MAINTAINERS: Add Florian as BCM5301X and BCM53573 maintainer

BCM5301X and BCM53573 commits go through Florian's stblinux.git so add
him as maintainer to make sure people e-mail him when sending patches.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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