net: mvpp2: fix typo in the tcam setup

This patch fixes a typo in the mvpp2_prs_tcam_data_cmp() function, as
the shift value is inverted with the data.

Fixes: 3f518509 ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>