MAINTAINERS: add a more searchable string for the H8300 architecture.

Add a parenthesized string of "H8300" for more convenient searchability
in the MAINTAINERS file.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -5638,7 +5638,7 @@ L:	uclinux-dev@uclinux.org  (subscribers-only)
 S:	Maintained
 F:	arch/m68knommu/
 
-UCLINUX FOR RENESAS H8/300
+UCLINUX FOR RENESAS H8/300 (H8300)
 P:	Yoshinori Sato
 M:	ysato@users.sourceforge.jp
 W:	http://uclinux-h8.sourceforge.jp/