[util] Iterate over patches in sorted order in vendor.py
[util] Iterate over patches in sorted order in vendor.py

The "sorted(..)" call got lost accidentally as part of commit 249b4c3.

Signed-off-by: Rupert Swarbrick <290093e2ad2515ed2f14d749293c8cf8e02ca274@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan