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/drivers/video/Kconfig b/drivers/video/Kconfig
index e32ce13..fe43fbd 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -66,7 +66,7 @@
 	hex "Default framebuffer size to use if no drivers request it"
 	default 0x1000000 if X86
 	default 0x800000 if !X86 && VIDEO_BOCHS
-	default 0 if !X86 && !VIDEO_BOCHS
+	default 0x0 if !X86 && !VIDEO_BOCHS
 	help
 	  Generally, video drivers request the amount of memory they need for
 	  the frame buffer when they are bound, by setting the size field in
@@ -1039,7 +1039,7 @@
 	hex "Default framebuffer size to use if no drivers request it at SPL"
 	default 0x1000000 if X86
 	default 0x800000 if !X86 && VIDEO_BOCHS
-	default 0 if !X86 && !VIDEO_BOCHS
+	default 0x0 if !X86 && !VIDEO_BOCHS
 	help
 	  Generally, video drivers request the amount of memory they need for
 	  the frame buffer when they are bound, by setting the size field in