ARM: initial support for RC Module UEMD SoCs

This commit adds minimal support for the UEMD SoCs
from RC Module (http://www.module.ru).

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
ARM: uemd: add DEBUG_LL support

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
ARM: dts: add minimal К1879ХБ1Я devicetree file

К1879ХБ1Я (AKA K1879HB1YA) is a SoC that combines
a DSP core based on the NeuroMatrix(r) family
with an ARM architecture CPU ARM1176JZF-S core.

See http://www.module.ru/en/catalog/micro/mikroshema_dekodera_cifrovogo_televizionnogo_signala_sbis_k1879hb1ya/ for details.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
ARM: uemd: add mb7707 board support

The MB 77.07 is a small (80x80 mm) single-board computer
developed in Russia by the RC Module.
It was developed as an educational board for К1879ХБ1Я SoC
capabilities demonstration.

See http://www.module.ru/en/catalog/micro/micro_pc/ for details.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
ARM: uemd: add module-mb7707_defconfig

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>