MAINTAINERS: make vDSO getrandom matches more generic

Rather than specifying matches for every architecture, what we actually
want is an extglob-like thing, such as:

F:      **/vdso/*getrandom*

Unfortunately, this isn't possible, but get_maintainers.pl does support
a "N:" directive that uses regexes, so just encode that extglob
statement as an ordinary regex.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

MAINTAINERS

@@ -19217,10 +19217,7 @@ F:	drivers/char/random.c
 F:	include/linux/random.h
 F:	include/uapi/linux/random.h
 F:	drivers/virt/vmgenid.c
-F:	include/vdso/getrandom.h
-F:	lib/vdso/getrandom.c
-F:	arch/x86/entry/vdso/vgetrandom*
-F:	arch/x86/include/asm/vdso/getrandom*
+N:	^.*/vdso/[^/]*getrandom[^/]+$
 
 RAPIDIO SUBSYSTEM
 M:	Matt Porter <mporter@kernel.crashing.org>