ls1046ardb: Add support power initialization

Add the chip power supply voltage initialization on LS1046ARDB.
Add function power_init_board(), and it will initialize the
PMIC and call the chip power initialization function.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

include/configs/ls1046ardb.h

@@ -164,6 +164,12 @@
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS	5
 #define I2C_RETIMER_ADDR			0x18
 
+/* PMIC */
+#define CONFIG_POWER
+#ifdef CONFIG_POWER
+#define CONFIG_POWER_I2C
+#endif
+
 /*
  * Environment
  */