mmc-utils: add check for max enhanced user area

In addition to user area, General purpose partition can be
be marked with enhanced attribute, retain enhanced attributes of
gp partition while creating enhanced user area and add
check for max enhanced area of the device.

Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <chris@printf.net>
2 files changed