ARM: dts: BCM5301X: Add basic DT for Linksys EA9500

It's tri-band wireless home router based on BCM47094 AKA BCM4709C0. It
uses 3 x BCM4366 chipsets for wireless.
Panamera seems to be board name used by Linksys.

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