build: support for Linux 6.1

build: support for Linux 6.1

6.1 commit de492c83cae0 ("prandom: remove unused functions") removed
prandom_u32, which was replaced and deprecated for get_random_u32 in
5.19 d4150779e60f ("random32: use real rng for non-deterministic
 randomness"). get_random_u32 was introduced in 4.11 c440408cf690
("random: convert get_random_int/long into get_random_u32/u64")

Use the cocci script from 81895a65ec63 ("treewide: use prandom_u32_max()
when possible, part 1"), along with a best guess for _max changes, introduced:
3.14 f337db64af05 ("random32: add prandom_u32_max and convert open coded users")