dm: gpio: Add DM compatibility to GPIO driver for Davinci

This adds DM_GPIO support for the davinici GPIO driver with
DT support.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/da850evm_defconfig b/configs/da850evm_defconfig
index bb1368b..6a2b7ae 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -23,7 +23,6 @@
 CONFIG_CRC32_VERIFY=y
 # CONFIG_CMD_EEPROM is not set
 # CONFIG_CMD_FLASH is not set
-# CONFIG_CMD_GPIO is not set
 # CONFIG_CMD_GPT is not set
 # CONFIG_CMD_PART is not set
 # CONFIG_CMD_SETEXPR is not set
@@ -37,6 +36,7 @@
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_DM=y
+CONFIG_DM_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_DM_I2C_COMPAT=y
 CONFIG_DM_SPI_FLASH=y