pfifo_fast: fix priomap reportin

Priomap was incorrectly (inconsistent with the kernel) as separate
fields:

('TCA_OPTIONS',
    {'bands': 3,
     'mark_01': 1,
     'mark_02': 2,
     'mark_03': 2,
     'mark_04': 2,
     'mark_05': 1,
     'mark_06': 2,
     'mark_07': 0,
     'mark_08': 0,
     'mark_09': 1,
     'mark_10': 1,
     'mark_11': 1,
     'mark_12': 1,
     'mark_13': 1,
     'mark_14': 1,
     'mark_15': 1,
     'mark_16': 1}),

When it should have been:
    ['TCA_OPTIONS',
        {'bands': 3,
         'priomap': (1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1)}],

Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>