radv: Invalidate L1 for VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT.

These are just shaders reads, so we need to invalidate L1.

Fixes: 6dbb0eac "radv: handle subpass cache flushes"
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
(cherry picked from commit f2c9f13e)