swupdate: Depend on util-linux if CONFIG_DISKPART is set
swupdate: Depend on util-linux if CONFIG_DISKPART is set

it depends on libfdisk/libfdisk.h for disk parition management
which is provided by util-linux

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Reviewed-by: Stefano Babic <2c2905e0c2877c7e4ce40c7425e972302953fda5@denx.de>

sbabic/meta-swupdate,sbabic/meta-swupdate