linux-phytec-fsl

powerpc/include: Add opal-prd to installed uapi headers

We'll want to build the opal-prd daemon with the prd headers, so include
this in the uapi headers list.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>