staging: lustre: lnet: lib-ptl.c: sparsa warning: symbol not declared

fixed sparse warning of following symbol not declared:
warning: symbol 'lnet_ptl_cleanup' was not declared. Should it be static?
warning: symbol 'lnet_ptl_setup' was not declared. Should it be static?

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>