Most of the MEM_* APIs share the same parameters, so they can be
generalised. Currently only MEM_SHARE is implemented and the user space
interface for that is not added yet.

Link: https://lore.kernel.org/r/20210521151033.181846-6-sudeep.holla@arm.comTested-by: NJens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>