crypto/octeontx: fix global log variable definition

crypto/octeontx: fix global log variable definition

'cpt_logtype' & 'otx_cryptodev_driver_id' global variables are defined
in a header file which was causing multiple definitions of the
variables. Fixed it by moving the required vars to the .c file and
introducing a new macro so the CPT_LOG macros in common/cpt would use
the associated PMD log var.

Issue has been detected by '-fno-common' gcc flag.

Fixes: bfe2ae495ee2 ("crypto/octeontx: add PMD skeleton")
Cc: stable@dpdk.org
Signed-off-by: Anoob Joseph <anoobj@marvell.com>
Reported-by: Ferruh Yigit <ferruh.yigit@intel.com>