Kconfigs: Correct default of "0" on hex type entries

It is not a parse error to have a default value of "0" for a "hex" type
entry, instead of "0x0".  However, "0" and "0x0" are not treated the
same even by the tools themselves. Correct this by changing the default
value from "0" to "0x0" for all hex type questions that had the
incorrect default. Fix one instance (in two configs) of a default of "0"
being used on a hex question to be "0x0". Remove the cases where a
defconfig had set a value of "0x0" to be used as the default had been
"0".

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

lib/Kconfig

@@ -862,7 +862,7 @@ config OF_LIBFDT
 config OF_LIBFDT_ASSUME_MASK
 	hex "Mask of conditions to assume for libfdt"
 	depends on OF_LIBFDT || FIT
-	default 0
+	default 0x0
 	help
 	  Use this to change the assumptions made by libfdt about the
 	  device tree it is working with. A value of 0 means that no assumptions