Convert CONFIG_HWCONFIG to Kconfig

This converts the following to Kconfig:
   CONFIG_HWCONFIG

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/Kconfig b/common/Kconfig
index 21434c5..053e93e 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -676,6 +676,10 @@
 	bool "Call set_cpu_clk_info"
 	depends on ARM
 
+config HWCONFIG
+	bool "hwconfig infrastructure"
+	default y if PPC || ARCH_LS1021A || FSL_LSCH2 || FSL_LSCH3
+
 config SYS_FSL_CLK
 	bool
 	depends on ARCH_LS1021A || FSL_LSCH2 || FSL_LSCH3 || \