MAINTAINERS: update entry for ARM/berlin

Synaptics has acquired the Multimedia Solutions Business of Marvell[1].
So change the berlin entry name and move it to its alphabetical
location. We move to ARM/Synaptics instead of ARM/Marvell.

This patch also updates my email address from marvell to synaptics.

[1] https://www.synaptics.com/company/news/conexant-marvell



Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>