power: Rename CONFIG_POWER to CONFIG_POWER_LEGACY

This option is used in pre-driver model code and much of it has never
been converted to driver model.

We want to add a new option to enable power support, so we can use a
simple rule in the Makefile. Rename this one, which is really about
a particular implementation of power.

Also update the pmic.h header file so it either includes the legacy
API or the driver model one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

board/compulab/cl-som-imx7/cl-som-imx7.c

@@ -267,7 +267,7 @@ int board_init(void)
 	return 0;
 }
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 #define I2C_PMIC	0
 int power_init_board(void)
 {
@@ -293,7 +293,7 @@ int power_init_board(void)
 
 	return 0;
 }
-#endif /* CONFIG_POWER */
+#endif /* CONFIG_POWER_LEGACY */
 
 /*
  * cl_som_imx7_setup_wdog() - watchdog configuration.

board/freescale/imx8mp_evk/spl.c

@@ -63,7 +63,7 @@ struct i2c_pads_info i2c_pad_info1 = {
 	},
 };
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 #define I2C_PMIC	0
 int power_init_board(void)
 {

board/freescale/imx8mq_evk/spl.c

@@ -156,7 +156,7 @@ int board_mmc_init(struct bd_info *bis)
 	return 0;
 }
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 #define I2C_PMIC	0
 int power_init_board(void)
 {

board/samsung/common/board.c

@@ -185,7 +185,7 @@ int board_early_init_f(void)
 }
 #endif
 
-#if defined(CONFIG_POWER) || defined(CONFIG_DM_PMIC)
+#if defined(CONFIG_POWER_LEGACY) || defined(CONFIG_DM_PMIC)
 int power_init_board(void)
 {
 	set_ps_hold_ctrl();

board/technexion/pico-imx7d/pico-imx7d.c

@@ -60,7 +60,7 @@ int dram_init(void)
 	return 0;
 }
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 #define I2C_PMIC	3
 int power_init_board(void)
 {

board/tqc/tqma6/tqma6.c

@@ -247,7 +247,7 @@ static const char *tqma6_get_boardname(void)
 	};
 }
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 /* setup board specific PMIC */
 int power_init_board(void)
 {

board/udoo/neo/neo.c

@@ -96,7 +96,7 @@ static struct i2c_pads_info i2c_pad_info1 = {
 };
 #endif
 
-#ifdef CONFIG_POWER
+#ifdef CONFIG_POWER_LEGACY
 int power_init_board(void)
 {
 	struct pmic *p;