i965/vec4/nir: vec4 also needs to remap vs attributes

i965/vec4/nir: vec4 also needs to remap vs attributes

Doubles need extra space, so we would need to do a remapping for vec4
too in order to take that into account. We reuse the already
existing remap_vs_attrs, but passing is_scalar, so they could
remap accordingly.

v2: code-format remap_vs_attrs_params initialization (Matt)

Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>