boards: arm: arty: fix compilation with v2c_daplink shield enabled

Fix the compilation of board.c when the DAPlink QSPI MUX devicetree
node is enabled.

Fixes: 3632815e2e124c0c4b1ed09cd91f60ecbd2fda83

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>
1 file changed