MAINTAINERS: remove Blue Swirl as SPARC maintainer

Blue is no longer active in the QEMU project, so remove him from the list of
SPARC maintainers.
Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
CC: Blue Swirl <blauwirbel@gmail.com>

MAINTAINERS

@@ -189,7 +189,6 @@ F: hw/sh4/
 F: disas/sh4.c
 
 SPARC
-M: Blue Swirl <blauwirbel@gmail.com>
 M: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
 M: Artyom Tarasenko <atar4qemu@gmail.com>
 S: Maintained