eal: add bitset type

Introduce a set of functions and macros that operate on sets of bits,
kept in arrays of 64-bit words.

RTE bitset is designed for bitsets which are larger than what fits in
a si

eal: add bitset type

Introduce a set of functions and macros that operate on sets of bits,
kept in arrays of 64-bit words.

RTE bitset is designed for bitsets which are larger than what fits in
a single machine word (i.e., 64 bits). For very large bitsets,
the <rte_bitmap.h> API may be a more appropriate choice.

Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

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