Convert CONFIG_HIKEY_GPIO et al to Kconfig

This converts the following to Kconfig:
   CONFIG_HIKEY_GPIO
   CONFIG_TCA642X

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/hikey_defconfig b/configs/hikey_defconfig
index 9eec928..d023653 100644
--- a/configs/hikey_defconfig
+++ b/configs/hikey_defconfig
@@ -30,6 +30,7 @@
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_PART=2
+CONFIG_HIKEY_GPIO=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_K3=y
 CONFIG_POWER_LEGACY=y