It is currently impossible to build DPDK with QAT Crypto PMD without selecting
the QAT Compress PMD [0]:
"
# The driver should not build if both compression and crypto are disabled
#FIXME common code depends on compression files so check only compress!
if not qat_compress # and not qat_crypto
    build = false
    reason = '' # rely on reason for compress/crypto above
    subdir_done()
endif
"

It should be possible to only select QAT Crypto PMD, especially since
compressdev APIs are all experimental.

[0]: https://git.dpdk.org/dpdk/tree/drivers/common/qat/meson.build#n58