service: fix C++ linkage
service: fix C++ linkage

"extern C" define is added to rte_service_component.h file
to be able to use in C++ context

Fixes: 21698354c832 ("service: introduce service cores concept")
Cc: stable@dpdk.org

Signed-off-by: Levend Sayar <92598be735da10e9e3d505aabc102f8192903749@gmail.com>
Acked-by: Harry van Haaren <b9ad04ed670c22cfa7f5f9ab17e311ca85d11a76@intel.com>

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