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.orgSigned-off-by: Theodore Ts'o <tytso@mit.edu>

include/linux/random.h

@@ -175,10 +175,6 @@ static inline bool arch_get_random_int(unsigned int *v)
 {
 	return 0;
 }
-static inline bool arch_has_random(void)
-{
-	return 0;
-}
 static inline bool arch_get_random_seed_long(unsigned long *v)
 {
 	return 0;
@@ -187,10 +183,6 @@ static inline bool arch_get_random_seed_int(unsigned int *v)
 {
 	return 0;
 }
-static inline bool arch_has_random_seed(void)
-{
-	return 0;
-}
 #endif
 
 /* Pseudo random number generator from numerical recipes. */