ARM: dts: AM33XX: Add AES data and documentation

ARM: dts: AM33XX: Add AES data and documentation

Add the generic AM33XX AES module's device tree data and
enable it for the am335x-evm, am335x-evmsk, and am335x-bone
platforms.  Also add Documentation file describing the data
for the AES module.

Cc: Paul Walmsley <[email protected]>
Signed-off-by: Mark A. Greer <[email protected]>
Signed-off-by: Joel Fernandes <[email protected]>
[[email protected]: Dropped interrupt-parent property, documentation fixups]
Signed-off-by: Benoit Cousson <[email protected]>