Clarify CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW in Kconfig

This is a "hex" prompt but the default value was given as an int.
Switch the default to hex (0x0) and remove the defconfigs that were
using the default, but as hex before.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 3bae072..33a8259 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -416,7 +416,7 @@
 
 config SYS_I2C_EEPROM_ADDR_OVERFLOW
 	hex "EEPROM Address Overflow"
-	default 0
+	default 0x0
 	help
 	  EEPROM chips that implement "address overflow" are ones
 	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of