scripts: Coccinelle script for pci_free_consistent()

Created coccinelle script for reporting missing pci_free_consistent() calls.

Signed-off-by: Petr Strnad <strnape1@fel.cvut.cz>
Signed-off-by: Nicolas Palix <nicolas.palix@imag.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>