DEVELOPERS: remove Synopsys email address for S.Matyukevich

I am no longer work at Synopsys, so remove this email address.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -2713,10 +2713,6 @@ F:	package/rtl8189fs/
 F:	package/wpa_supplicant/
 F:	package/xr819-xradio/
 
-N:	Sergey Matyukevich <sergey.matyukevich@synopsys.com>
-F:	board/synopsys/nsim/
-F:	configs/snps_arc700_nsim_defconfig
-
 N:	Sergio Prado <sergio.prado@e-labworks.com>
 F:	board/toradex/apalis-imx6/
 F:	configs/toradex_apalis_imx6_defconfig