Convert CONFIG_POWER_LTC3676 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_POWER_FSL
   CONFIG_POWER_FSL_MC13892
   CONFIG_POWER_HI6553
   CONFIG_POWER_LTC3676
   CONFIG_POWER_PFUZE100
   CONFIG_POWER_PFUZE3000
   CONFIG_POWER_SPI
   CONFIG_POWER_TPS65090_EC
   CONFIG_POWER_TPS65218
   CONFIG_POWER_TPS65910

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig
index f73123e..78e63c9 100644
--- a/configs/am335x_evm_defconfig
+++ b/configs/am335x_evm_defconfig
@@ -102,6 +102,7 @@
 CONFIG_DM_PMIC=y
 # CONFIG_SPL_DM_PMIC is not set
 CONFIG_PMIC_TPS65217=y
+CONFIG_SPL_POWER_TPS65910=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_OMAP3_SPI=y