i965: Use DIV_ROUND_UP() in gen7_urb.c code.
i965: Use DIV_ROUND_UP() in gen7_urb.c code.

This is a newer convention, which we prefer over ALIGN(x, n) / n.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler