ARM: dts: Enable Broadcom Cygnus SoC

DT files to enable cygnus consisting on reference designs
and cygnus core configuration.

Reviewed-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Arun Parameswaran <aparames@broadcom.com>
Tested-by: Jonathan Richardson <jonathar@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
MAINTAINERS: Entry for Cygnus/iproc arm architecture

Acked-by: Jonathan Richardson <jonathar@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
ARM: mach-bcm: Consolidate currently supported IPROC SoCs

Move ARCH_BCM_5301X subarch under ARCH_IPROC architecture.
Additional IPROC chipsets that share a lot of commonality should be
added under ARCH_IPROC as well.
Added defconfig generation components