armv8: ls1028ardb: enable DisplayPort Power support

Enable DP_PWR signal to power the DP to HDMI converter cable.

Signed-off-by: Wen He <wen.he_1@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/ls1028a_common.h b/include/configs/ls1028a_common.h
index 4bd510d..05b8cf0 100644
--- a/include/configs/ls1028a_common.h
+++ b/include/configs/ls1028a_common.h
@@ -210,6 +210,9 @@
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS	3
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS	5
 
+/* DisplayPort */
+#define DP_PWD_EN_DEFAULT_MASK          0x8
+
 #ifdef CONFIG_NXP_ESBC
 #include <asm/fsl_secure_boot.h>
 #endif