Camera: Require EXIF_TAG_MODEL starts/ends with Build.MODEL

In some countries, the Build.MODEL needs to be kept confidential during
carrier certification, and it cannot change post ceritification. As a
result, it's not possible to change Build.MODEL to the user facing
model name.

Checking EXIF_TAG_MODEL starts/ends with Build.MODEL works
around this problem.

Test: Camera CTS
Bug: 340189699
Change-Id: I328ee878e8fae065159239120f61c2d719d0c666