LU-1346 libcfs: cleanup libcfs primitive (linux-prim.h)

LU-1346 libcfs: cleanup libcfs primitive (linux-prim.h)

Affected primitives:

CFS_KERN_XXX, CFS_L1_CACHE_ALIGN, CFS_NR_IRQS, CFS_EXPORT_SYMBOL,
cfs_psdev_t, cfs_psdev_register/deregister, cfs_sysctl_table_t,
cfs_sysctl_table_header_t, cfs_unregister_sysctl_table,
PORTAL_SYMBOL_PUT/GET, PORTAL_MODULE_USE/UNUSE, cfs_(try_)module_get,
__cfs_module_get, cfs_module_refcount, cfs_module_t,
cfs_request_module

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Ie1ab42d60b2cba052bb21f4ec5b02a7f7a555515
Reviewed-on: http://review.whamcloud.com/6954
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>