random: Blocking API for accessing nonblocking_pool

The added API calls provide a synchronous function call
get_blocking_random_bytes where the caller is blocked until
the nonblocking_pool is initialized.

CC: Andreas Steffen <[email protected]>
CC: Theodore Ts'o <[email protected]>
CC: Sandy Harris <[email protected]>
Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
2 files changed