build: Make (DIRS-y) depend on mk/cc.mk

In parallel make, it was previously possible for sub-directories
to start compiling before mk/cc.mk was checked. This doesn't
really cause a problem, but set up the dependencies to ensure
it is always checked before proceeding with the compilation.

Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Change-Id: I9152095eaebf21e242aa5472f800f036fe8d0751
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2554


Community-CI: Broadcom CI
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>