MAINTAINERS: Update after GEHC spin-off

Update our email addresses, from @ge.com to @gehealthcare.com, after GE
HealthCare was spun-off from GE.

Remove Antti, who no longer works on the project.

Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>

MAINTAINERS

@@ -455,7 +455,7 @@ F:	drivers/timer/mchp-pit64b-timer.c
 
 ARM MSC SM2S IMX8MP SOM
 M:	Martyn Welch <martyn.welch@collabora.com>
-M:	Ian Ray <ian.ray@ge.com>
+M:	Ian Ray <ian.ray@gehealthcare.com>
 S:	Maintained
 F:	arch/arm/dts/imx8mp-msc-sm2s*
 F:	board/msc/sm2s_imx8mp/

board/ge/b1x5v2/MAINTAINERS

 GE B1X5V2 BOARD
-M:	Huan 'Kitty' Wang <HuanWang@ge.com>
-M:	Ian Ray <ian.ray@ge.com>
+M:	Huan 'Kitty' Wang <HuanWang@gehealthcare.com>
+M:	Ian Ray <ian.ray@gehealthcare.com>
 M:	Martyn Welch <martyn.welch@collabora.com>
 S:	Maintained
 F:	arch/arm/dts/imx6dl-b1x5v2.dts

board/ge/bx50v3/MAINTAINERS

 GE BX50V3 BOARD
-M:	Ian Ray <ian.ray@ge.com>
+M:	Ian Ray <ian.ray@gehealthcare.com>
 M:	Martyn Welch <martyn.welch@collabora.com>
 S:	Maintained
 F:	arch/arm/dts/imx6q-b450v3.dts

board/ge/mx53ppd/MAINTAINERS

 GE PPD BOARD
-M:	Antti Mäentausta <antti.maentausta@ge.com>
-M:	Ian Ray <ian.ray@ge.com>
+M:	Ian Ray <ian.ray@gehealthcare.com>
 M:	Martyn Welch <martyn.welch@collabora.com>
 S:	Maintained
 F:	arch/arm/dts/imx53-ppd*