net/nfp: rename files for consistency

Rename the nfp_net.c file to nfp_common as it now contains functions
common to VF and PF functionality. Rename the header file too to be
consistent. Also remove

net/nfp: rename files for consistency

Rename the nfp_net.c file to nfp_common as it now contains functions
common to VF and PF functionality. Rename the header file too to be
consistent. Also remove the "net" naming from the _ctrl and _logs files
for consistency across the PMD.

Signed-off-by: Heinrich Kuhn <[email protected]>
Signed-off-by: Simon Horman <[email protected]>

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