skb allocation / consumption corelator - Add config option

This patch adds a Kconfig option to enable the addtition of the skb source
tracer.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

 Kconfig |   10 ++++++++++
 1 file changed, 10 insertions(+)
Signed-off-by: David S. Miller <davem@davemloft.net>