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>
diff --git a/boot/Kconfig b/boot/Kconfig
index e8fb03b..b00d7a8 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1007,7 +1007,7 @@
 
 config BOOTSTAGE_STASH_ADDR
 	hex "Address to stash boot timing information"
-	default 0
+	default 0x0
 	help
 	  Provide an address which will not be overwritten by the OS when it
 	  starts, so that it can read this information when ready.