Configs: am3517_evm: Remove TWL4030 reference

This SOM and kit do not nor have they ever had a twl4030 PMIC.
This patch removes the references to it.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/am3517_evm_defconfig b/configs/am3517_evm_defconfig
index e845e35..96491f3 100644
--- a/configs/am3517_evm_defconfig
+++ b/configs/am3517_evm_defconfig
@@ -46,6 +46,7 @@
 CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_MII=y
 CONFIG_DRIVER_TI_EMAC=y
+# CONFIG_TWL4030_POWER is not set
 CONFIG_CONS_INDEX=3
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y