ocf: update OCF submodule

Update OCF submodule to get 2 new API functions:
* ocf_mngt_cache_trylock()
* ocf_cache_has_pending_requests()

Change-Id: I2a1fee104bfd55dfb2e99ec538ec180681bd0f30
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/449555


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>