Convert CONFIG_TPS6586X_POWER et al to Kconfig

This converts the following to Kconfig:
   CONFIG_TPS6586X_POWER
   CONFIG_TWL6030_POWER

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/seaboard_defconfig b/configs/seaboard_defconfig
index 686a3c0..2375040 100644
--- a/configs/seaboard_defconfig
+++ b/configs/seaboard_defconfig
@@ -50,6 +50,7 @@
 CONFIG_DM_PMIC=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_TPS6586X_POWER=y
 CONFIG_PWM_TEGRA=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y