caam/qi driver fails to compile when CONFIG_DEBUG_FORCE_WEAK_PER_CPU=y.
Fix it by making the offending local per_cpu variable global.

Cc: <stable@vger.kernel.org>
Fixes: 67c2315d ("crypto: caam - add Queue Interface (QI) backend support")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>