ARM: dts: DRA7: Add DT nodes for AES IP

DRA7 SoC has the same AES IP as OMAP4. Add DT entries for both AES cores.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[t-kristo@ti.com: squashed in the change to use EDMA, squashed in
                  support for two AES cores]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>