net/bnxt: fix build with debug macro

net/bnxt: fix build with debug macro

Setting 'RTE_LIBRTE_BNXT_TRUFLOW_DEBUG' macro cause build error,
removing it.

Also with meson build system compile time debug macros should be
documented in driver documentation, since there is no other way to
figure out their existence.

Fixes: ad9eed0248ad ("net/bnxt: support flow template for Thor")
Cc: stable@dpdk.org
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>