configs/arcturus_ucls1012a: new defconfig

configs/arcturus_ucls1012a: new defconfig

The uCLS1012A-SOM product family (ucls1012a) is an Arcturus Networks Inc.
64bit ARM Cortex-A53 class System on Module powered by a NXP QorIQ LS1012A
Low Power Communication Processor.  This 314 pin MXM3.0/SMARC module card
contains DDR3, QSPI NOR Flash, eMMC NAND Flash, optional Audio CODEC and is
available with 1 or 2 Gig-Ethernet PHYs.

Signed-off-by: Oleksandr Zhadan <oleks@arcturusnetworks.com>
Signed-off-by: Michael Durrant <mdurrant@arcturusnetworks.com>
Changes v1 -> v2:
    - updated kernel and u-boot source repositories to github

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>