v3d: add R10G10B10X2_UNORM to format table

Fixes following piglit fails:
spec@ext_framebuffer_object@fbo-blending-formats
spec@ext_framebuffer_object@fbo-blending-formats@GL_RGB10

Cc: mesa-stable
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13051>
2 files changed