alf_queue: drop unneeded "next" arguments for enq/deq helpers

The "memcpy" helper were the only user of the p_next/c_next argument.
It can reconstruct this argument.  The memcpy variant was too slow
anyway, thus I don't care keep it for this func.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
alf_queue_disassemble: compiler generate smaller code for constants

The compiler will generate more specific/smaller code when number of
enqueue elements is a constant.  Thus, the ASM size of helper
functions depend on the specific use-case.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>