openamp: update openamp_git to newer master commit
openamp: update openamp_git to newer master commit

As the license file has been updated to use SPDX license identifier,
update both the SRCREV and the license file checksum in the _git recipe.

Signed-off-by: Wendy Liang <cac46fad14f88489ab4dbc3c1082c7dafae20187@xilinx.com>

OpenAMP/meta-openamp,OpenAMP/meta-openamp