lvm2: add PACKAGECONFIG for readline
lvm2: add PACKAGECONFIG for readline

* it's autodetected from sysroot

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

WindRiver-OpenSourceLabs/meta-oe-subset,WindRiver-OpenSourceLabs/meta-oe-subset