hwrng: remove Michael as HWRNG maintainer

It turns out that I rewrote the HWRNG core once to make it pluggable, but
I'm not a crypto-expert at all.  So I'm certainly the wrong person for
being a maintainer of the HWRNG core.  Let's orphan it.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -1712,9 +1712,7 @@ T:	git lm-sensors.org:/kernel/mhoffman/hwmon-2.6.git release
 S:	Maintained
 
 HARDWARE RANDOM NUMBER GENERATOR CORE
-P:	Michael Buesch
-M:	mb@bu3sch.de
-S:	Maintained
+S:	Orphaned
 
 HARD DRIVE ACTIVE PROTECTION SYSTEM (HDAPS) DRIVER
 P:	Robert Love