Deprecate HildonPannableArea:size-request-policy
Deprecate HildonPannableArea:size-request-policy

Fixes: MB#5284

archlinuxarm-n900/libhildon,community-ssu/hildon,community-ssu/hildon,archlinuxarm-n900/libhildon,archlinuxarm-n900/libhildon,community-ssu/hildon