Convert CONFIG_HWCONFIG to Kconfig

This converts the following to Kconfig:
   CONFIG_HWCONFIG

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/legoev3_defconfig b/configs/legoev3_defconfig
index 98e37f1..90c1b94 100644
--- a/configs/legoev3_defconfig
+++ b/configs/legoev3_defconfig
@@ -23,6 +23,7 @@
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_LATE_INIT=y
 CONFIG_CLOCKS=y
+CONFIG_HWCONFIG=y
 CONFIG_HUSH_PARSER=y
 # CONFIG_BOOTM_NETBSD is not set
 # CONFIG_BOOTM_PLAN9 is not set