arm:am43xx: Add TPS65218 support to scale voltages up

This family is supported by the TPS65218 PMIC.  Implement a scale_vcores
to set the MPU and CORE voltage correctly to the max frequency that is
supported (and what we will be scaling them to in setup_dplls()).

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index 8359621..823cba6 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -32,11 +32,15 @@
 #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN	2
 #define CONFIG_SYS_I2C_MULTI_EEPROMS
 
+/* Power */
+#define CONFIG_POWER_TPS65218
+
 /* SPL defines. */
 #define CONFIG_SPL_TEXT_BASE		0x40300350
 #define CONFIG_SPL_MAX_SIZE		(220 << 10)	/* 220KB */
 #define CONFIG_SYS_SPL_ARGS_ADDR	(CONFIG_SYS_SDRAM_BASE + \
 					 (128 << 20))
+#define CONFIG_SPL_POWER_SUPPORT
 #define CONFIG_SPL_YMODEM_SUPPORT
 
 /* Enabling L2 Cache */