pvr: Don't overwrite PDS vertex input flags
What does this MR do and why?
Fixes
dEQP-VK.draw.renderpass.simple_draw.simple_draw_triangle_list
dEQP-VK.draw.renderpass.simple_draw.simple_draw_triangle_strip
dEQP-VK.draw.renderpass.indexed_draw.draw_indexed_triangle_list
dEQP-VK.draw.renderpass.indexed_draw.draw_indexed_triangle_strip
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Reviewed-by: Karmjit Mahil <Karmjit.Mahil@imgtec.com>
Edited by Matt Coster