Convert LIB_UUID to Kconfig

config_fallback.h has some logic that checks a variety of options
and selects LIB_UUID if it hasn't already been selected.  This
will all LIB_UUID in Kconfig and select this option for the list
of options to allow us to remove the logic from fallbacks

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index 87db2e3..5178e86 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -18,6 +18,9 @@
 config HAVE_PRIVATE_LIBGCC
 	bool
 
+config LIB_UUID
+	bool
+
 config USE_PRIVATE_LIBGCC
 	bool "Use private libgcc"
 	depends on HAVE_PRIVATE_LIBGCC