shpchp: remove DBG_XXX_ROUTINE

This patch removes DBG_ENTER_ROUTINE, DBG_LEAVE_ROUTINE and related
code.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>