ARM: PRIMA2: provide two DEBUG_LL ports for prima2 and marco

prima2 and marco has different memory base, the old code will
fail if we enable DEBUG_LL in marco.
this patch adds two debuf port, while debugging, we select one
of PRIMA2 and MARCO debug ports, in the products, we disable
DEBUG_LL.

Signed-off-by: Barry Song <Baohua.Song@csr.com>