This option only complicates the code unnecessarily, just use
CONFIG_SYS_DEF_EEPROM_ADDR as the default address if there are
only five arguments to eeprom {read/write} if this is defined.
If CONFIG_SYS_DEF_EEPROM_ADDR is not defined, we mandate all
six arguments.
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com> Cc: Heiko Schocher <hs@denx.de> Reviewed-by: Heiko Schocher <hs@denx.de>