HMM: add discard range helper (to clear and free resources for a range).

A common use case is for device driver to stop caring for a range of
address long before said range is munmapped by userspace program. To
avoid keeping track of such range provide an helper function that will
free HMM resources for a range of address.

NOTE THAT DEVICE DRIVER MUST MAKE SURE THE HARDWARE WILL NO LONGER
ACCESS THE RANGE BECAUSE CALLING THIS HELPER !

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>

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