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/misc/Kconfig b/drivers/misc/Kconfig
index b9f5c7a..a6e3f62 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -555,7 +555,7 @@
 config SYS_I2C_EEPROM_ADDR
 	hex "Chip address of the EEPROM device"
 	depends on ID_EEPROM || I2C_EEPROM || SPL_I2C_EEPROM || CMD_EEPROM || ENV_IS_IN_EEPROM
-	default 0
+	default 0x0
 
 if I2C_EEPROM