common/sfc_efx: do not include libefx headers from efsys.h
common/sfc_efx: do not include libefx headers from efsys.h

efsys.h may depends on target system headers only. Otherwise, it could
result in cross-dependency when libefx header depends on efsys.h and
efsys.h depends on the libefx header.

Signed-off-by: Andrew Rybchenko <ac94ab2a8fe9a9a087f6e24dcbc16626b52c07e8@solarflare.com>
Reviewed-by: Andrew Lee <03cc0227640d40013ba6c3cabf2a564af71c7a49@xilinx.com>
Reviewed-by: Andy Moreton <adbee5d9b6a6a553b71b14302d03837591e26c9d@xilinx.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk