Replace ext_csd "enhanced_area_en" attribute by
 "partition_setting_completed". It was used whether or
 not enhanced user area is defined and without checks of
 EXT_CSD_PARTITION_SETTING_COMPLETED bit.
Signed-off-by: NGrégory Soutadé <gsoutade@neotion.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>