eal/armv7: emulate vaddvq u16 variant
eal/armv7: emulate vaddvq u16 variant

vaddvq_u16() is not available for armv7.
Emulate the vaddvq_u16() using armv7 NEON intrinsics.

Signed-off-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>
Acked-by: Jianbo Liu <ad48e27d4475ec2c10ba93ba465af79f05639344@linaro.org>

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