memshare: Respond to query qmi always with boot time init value

Query qmi is for a client to know what memshare driver can allocate.
Presently query qmi is responded with what has been allocated.
Modify the response to convey what is initialized at boot time
by parsing dts entries.

Change-Id: I8a06b5df0472e0409d5873c763478db4d41accd2
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>