m68k: pass rng seed via BI_RNG_SEED

In order to pass fresh entropy to kexec'd kernels, use BI_RNG_SEED
for passing a seed, with the same semantics that kexec-tools currently
uses for i386's setup_data.

Link: https://git.kernel.org/torvalds/c/dc63a086daee92c63e3
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Simon Horman <horms@kernel.org>
3 files changed