ARM: dts: brcmstb: add BCM7445 GPIO nodes

Need the aon_pm_l2_intc and irq0_aon_intc descriptions, so included
those as well.

Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>