configs: nitrogen6x: Add DM_GPIO support

Add CONFIG_DM_GPIO to all defconfigs whose board is
nitrogen6x.

mx6qsabrelite_defconfig
nitrogen6dl2g_defconfig
nitrogen6dl_defconfig
nitrogen6q2g_defconfig
nitrogen6q_defconfig
nitrogen6s1g_defconfig

This is in preparation for adding CONFIG_DM_SPI.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
7 files changed