LU-5275 lprocfs: reduce scope of params_tree.h

LU-5275 lprocfs: reduce scope of params_tree.h

Only include libcfs/params_tree.h for kernel builds. Eliminate the
include cycle between libcfs.h and params_tree.h. Remove nonsensical
stub definitions for struct file, struct inode, and others. Remove
several uses of PDE() by modifying LPROCFS_ENTRY_CHECK() to accept a
struct inode * rather than a struct proc_dir_entry *. Correct several
nop uses of LPROCFS_ENTRY_CHECK().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ib70575b05366565c95c1db857023c5481325308a
Reviewed-on: http://review.whamcloud.com/13225
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>