bitmap: add init with all bits set

bitmap: add init with all bits set

Currently, in the case to use bitmap as resource allocator, after
bitmap creation, all the bitmap bits should be set to indicate the
bit available. Every time when allocate one bit, search for the set
bits and clear it to make it in use.

Add a new rte_bitmap_init_with_all_set() function to have a quick
fill up the bitmap bits.

Comparing with the case create the bitmap as empty and set the bitmap
one by one, the new function costs less cycles.

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>