ARM: dts: DRA7: Add support for SHA IP

DRA7 SoC has the same SHA IP as OMAP5. Add DT entry for the same.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[t-kristo@ti.com: changed SHA to use EDMA instead of SDMA]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>