MAINTAINERS: move BCM63xx ARM-based SoCs git tree

Update the Broadcom BCM63xx ARM-based SoCs git tree from
github.com/brcm/linux.git to github.com/broadcom/arm-bcm63xx.git where
it now belongs.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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