expamples/ip_pipeline: convert to SPDX license tag
expamples/ip_pipeline: convert to SPDX license tag

Signed-off-by: Gavin Hu <207ee22c2cf71e20c5b5df8395050c07c07d8709@linaro.org>
Acked-by: Hemant Agrawal <90d96ef1ecd8ed49b97c7897be950e80824a9c5c@nxp.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk