dts/ls2080a: Add DTS support for LS2080a QDS & RDB boards

This patch adds the LS2080a DTS files for QDS and RDB boards
which support the LS2080a SoC.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>