ehea: Increase the skb array usage

Currently the skb array is not fully allocated, and the allocation
is done as it's requested, which is not the expected way.

This patch just allocate the full skb array at driver initialization.
Also, this patch increases ehea version to 107.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>