ARM: cygnus defconfig : Initial defconfig for Broadcom Cygnus SoC

This defconfig is utilized so a customer or developer can understand
what kernel drivers are utilized by the Cygnus SoC.  It also enables
debug configs which should be disabled if optimal performance is
desired.

Tested-by: Jonathan Richardson <jonathar@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
ARM: dts: Enable Broadcom Cygnus SoC

DT files to enable cygnus consisting of the enterprise phone board
variant 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 and clock drivers

Acked-by: Jonathan Richardson <jonathar@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
Added defconfig generation components