i965/vec4: Use a stride of 1 and byte offsets for UBOs

i965/vec4: Use a stride of 1 and byte offsets for UBOs

Cc: "11.0" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92909
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 05bdc21f84edc200a0b0a695b79d12f25cc00645)
[Emil Velikov: s/brw_imm_ud/src_reg/g;s/brw_imm_d/src_reg/]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Conflicts:
	src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
	src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp