msm: camera: smmu: Move to ioremap APIs for using FW memory

When loading the camera FW, use the appropriate APIs
depending on the kernel version to map the FW region.

CRs-Fixed: 2564857
Change-Id: I2104b63b54bce799c8e44f36c49042de86f78c7e
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Karthik Jayakumar <kjayakum@codeaurora.org>