layerscape: add ls2088ardb device support

The QorIQ LS2088A processor is built on the Layerscape
architecture combining eight ARM A72 processor cores
with advanced, high-performance datapath acceleration
and network, peripheral interfaces required for
networking, telecom, wireless infrastructure, aerospace
applications and general-purpose embedded applications.

Features summary:
- Eight 64-bit ARM v8 Cortex-A72 CPUs
- Two 64-bit DDR4 SDRAM memory controller with ECC
- One 32-bit DDR3 SDRAM memory controller with ECC
- Data path acceleration architecture 2.0 (DPAA2)
- Ethernet interfaces
- IFC, 4 PCIe, 2 SATA, 2 USB, 1 SDXC, 2 DUARTs etc

Signed-off-by: Yutang Jiang <yutang.jiang@nxp.com>