MAINTAINERS: rtc: update my email address

Free Electrons is now Bootlin.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>

MAINTAINERS

@@ -11693,7 +11693,7 @@ X:	kernel/torture.c
 
 REAL TIME CLOCK (RTC) SUBSYSTEM
 M:	Alessandro Zummo <a.zummo@towertech.it>
-M:	Alexandre Belloni <alexandre.belloni@free-electrons.com>
+M:	Alexandre Belloni <alexandre.belloni@bootlin.com>
 L:	linux-rtc@vger.kernel.org
 Q:	http://patchwork.ozlabs.org/project/rtc-linux/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git