DEVELOPERS: update email address for Mark Corbin

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit dca3a64b48a8a160477d46bec763b6a5478138d2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1440,7 +1440,7 @@ F:	package/lynx/
 N:	Mario Rugiero <mrugiero@gmail.com>
 F:	package/ratpoison/
 
-N:	Mark Corbin <mark.corbin@embecosm.com>
+N:	Mark Corbin <mark@dibsco.co.uk>
 F:	arch/arch.mk.riscv
 F:	arch/Config.in.riscv
 F:	board/qemu/riscv32-virt/