msm: camera: icp: Fix out of bound issue in ICP

Number of IPE devices change based on the target, so memory
is allocated based on number of devices.

Access IPE1 device interface if it is only allocated to avoid
out of bound access to read

Change-Id: I8a99e57ee4640d68e43855d4e63b4f32119e8398
Signed-off-by: Suresh Vankadara <svankada@codeaurora.org>