Use //sdk/lib/magma_client:magma_headers dep for magma headers

The target in //src/graphics/lib/magma/include:magma is old and doesn't
reflect the actual header location anymore.

Change-Id: I1ce80999cf23d6124ec64d523038e413560653fe
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/876841
Reviewed-by: Craig Stout <cstout@google.com>
6 files changed