DEVELOPERS: Update email address

I am leaving Xilinx so to avoid future bounces update my email address
to my personal email address.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Alistair Francis <alistair@alistair23.me>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -98,7 +98,7 @@ N:	Alexandre Esse <alexandre.esse.dev@gmail.com>
 F:	package/kvazaar/
 F:	package/v4l2loopback/
 
-N:	Alistair Francis <alistair.francis@xilinx.com>
+N:	Alistair Francis <alistair@alistair23.me>
 F:	package/xen/
 
 N:	Alvaro G. M <alvaro.gamez@hazent.com>