avr32: boards/atngw100/mrmt.c: fix building error
avr32: boards/atngw100/mrmt.c: fix building error

there is an additional "{", which causes building error.

Signed-off-by: Cong Ding <8001b54ad539330acc19ca3e17ac1f04f07b36a6@gmail.com>
Acked-by: Hans-Christian Egtvedt <11ce19a6fc3bb47abce595a29a6ea4cfed5efa4c@samfundet.no>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs