msm: adsprpc: Fix for hyp_assign_phys double call

A check is introduced to restrict  the double call of
hyp_assign_phys for the same address.

Change-Id: I0ac984af9fe456d317c7c2d99d6d1290f86830e8
Acked-by: Sandheep Balasubramanian <sandheep@qti.qualcomm.com>
Signed-off-by: Vamsi Krishna Gattupalli <quic_vgattupa@quicinc.com>