UPSTREAM: linux/random.h: Remove arch_has_random, arch_has_random_seed

The arm64 version of archrandom.h will need to be able to test for
support and read the random number without preemption, so a separate
query predicate is not practical.

Since this part of the generic interface is unused, remove it.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200110145422.49141-5-broonie@kernel.org


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit 647f50d5d9d933b644b29c54f13ac52af1b1774d)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 148665638
Change-Id: I6a9c8c67ca959a628fc4bc7294c3c1793fceaf7f