package/libnss: bump version to 3.52

Bump version to 3.52 and drop all patches since they've all been
upstreamed.

Release notes:
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.52_release_notes



Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>