freedreno/ir3: remove assert

freedreno/ir3: remove assert

Fixes dEQP-GLES31.functional.ubo.random.all_per_block_buffers.13 and .20

ca3eb5db665cbcc2de5a5d3158e3dc68f86e5822 went from silently truncating
the constant state, which was also the wrong thing to do, to an assert.
Which then showed up in a couple of dEQPs.  Actually there is nothing
wrong with larger constant file so just drop the assert.

Signed-off-by: Rob Clark <robdclark@chromium.org>