freedreno/ir3: fix lowered ubo region alignment

freedreno/ir3: fix lowered ubo region alignment

Since we emit UBO regions INDIRECTly (ie. not copied into cmdstream but
emit by EXT_SRC_ADDR) we need to keep them 4*vec4 aligned.  Which the
code already mostly did, except for aligning the first UBO region itself
(ie. the one after block==0 which is the "real" uniforms).

Fixes: 893425a607a freedreno/ir3: Push UBOs to constant file
Fixes: 3c8779af325 freedreno/ir3: Enable PIPE_CAP_PACKED_UNIFORMS
Signed-off-by: Rob Clark <robdclark@chromium.org>