Add missing volk_16_byteswap_u_orc to puppet

[argilo]

volk_16u_byteswap_u_orc is not tested or profiled, because it does not have a wrapper in volk_16u_byteswappuppet_16u. Here I've added the missing wrapper.

The volk_16u_byteswap_u_orc protokernel seems to work fine, and has perforance comparable to the others:

$ apps/volk_profile -n -R byteswappuppet_16u
Warning: this IS a dry-run. Config will not be written!
RUN_VOLK_TESTS: volk_16u_byteswappuppet_16u(131071,1987)
generic completed in 54.6349 ms
u_sse2 completed in 41.4502 ms
a_sse2 completed in 40.915 ms
u_avx2 completed in 28.288 ms
a_avx2 completed in 28.9922 ms
u_orc completed in 32.8863 ms
Best aligned arch: u_avx2
Best unaligned arch: u_avx2

[jdemel]

LGTM