drivers/net: return number of supported packet types

Missing "RTE_PTYPE_UNKNOWN" ptype causes buffer overflow.
Enhance code such that the dev_supported_ptypes_get()
function pointer now returns the

drivers/net: return number of supported packet types

Missing "RTE_PTYPE_UNKNOWN" ptype causes buffer overflow.
Enhance code such that the dev_supported_ptypes_get()
function pointer now returns the number of elements to
eliminate the need for "RTE_PTYPE_UNKNOWN" as the last item.

Same applied to 'buffer_split_supported_hdr_ptypes_get()' dev_ops too.

Signed-off-by: Sivaramakrishnan Venkat <venkatx.sivaramakrishnan@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@amd.com>

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net/ngbe: support packet type query

Add packet type macro definition and convert ptype to ptid.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>