MAINTAINERS: remove kernel@stlinux.com obsolete mailing list

The STMicroelectronics dedicated mailing list kernel@stlinux.com
is no more available, remove it to avoid bouncing mails.

Several request to create a new mailing list has been send by Benjamin
Gaignard and me but without any answers.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

MAINTAINERS

@@ -1829,7 +1829,6 @@ F:	drivers/edac/altera_edac.
 ARM/STI ARCHITECTURE
 M:	Patrice Chotard <patrice.chotard@st.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-L:	kernel@stlinux.com
 W:	http://www.stlinux.com
 S:	Maintained
 F:	arch/arm/mach-sti/
@@ -11264,7 +11263,6 @@ F:	drivers/media/rc/serial_ir.c
 
 STI CEC DRIVER
 M:	Benjamin Gaignard <benjamin.gaignard@linaro.org>
-L:	kernel@stlinux.com
 S:	Maintained
 F:	drivers/staging/media/st-cec/
 F:	Documentation/devicetree/bindings/media/stih-cec.txt