radeonsi: add shader info for frag coord and sample pos read

To construct spi_ps_input when ACO compilation.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22573>
2 files changed