func.renderpass.clear.color-render-area: Use t_render_pass
This test records two render passes to build an image on a color attachment. It has a bug though: the second render pass reuses the first VkRenderPass object that discards the image contents by transitioning from the UNDEFINED layout. Fix this by using the framework-provided t_render_pass object for the first render pass and update the second render pass to avoid any layout transitions.
Fixes failures on anv/gfx9+.