ARM: dts: DRA7: Add device nodes for ABB

Add ABB device nodes for DRA7 family of devices. Data is based on
DRA7 Technical Reference Manual revision I (Sept 2013)

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>