configs: P2020RDB: enable DM_I2C and DM_RTC

This enables DM_I2C and DM_RTC in P2020RDB defconfigs

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/P2020RDB-PC_defconfig b/configs/P2020RDB-PC_defconfig
index e37ca66..dd5c14e4 100644
--- a/configs/P2020RDB-PC_defconfig
+++ b/configs/P2020RDB-PC_defconfig
@@ -70,3 +70,5 @@
 CONFIG_FSL_ESPI=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
+CONFIG_DM_I2C=y
+CONFIG_DM_RTC=y