vc4: Enable lower_umax and lower_umin

VC4 doesn't have support for UMAX and UMIN integer operations. So
we should avoid algebraic optimizations that generate umax/umin ops.

Fixes: 8e1b75b330 ("nir/algebraic: optimize iand/ior of (n)eq zero")
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7083>

src/gallium/drivers/vc4/vc4_program.c

@@ -2191,6 +2191,8 @@ static const nir_shader_compiler_options nir_options = {
         .lower_negate = true,
         .lower_rotate = true,
         .lower_to_scalar = true,
+        .lower_umax = true,
+        .lower_umin = true,
         .max_unroll_iterations = 32,
 };