AI-generated suggestion for a Null Pointer Exception.

Bug: 433865328

Flag: EXEMPT bugfix

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AI reasoning:
- The upstream fix filters out any null `SensorPropertiesInternal` objects from the list returned by `BiometricService.getSensorProperties()`. This prevents nulls from propagating up the call stack.
- The midstream fix adds a null check in `BiometricService.getSensorProperties()` to ensure that null `SensorPropertiesInternal` objects are not added to the list that is returned to the caller.
- The downstream fix adds a null check in `SensorPropertiesInternal.from()` to prevent the NPE. It also changes the annotation of the `prop` parameter and the return type to `@Nullable` to reflect the possibility of null values.

Change-Id: Id48d71d9f93cb1fa3960e83662e4ff2766cd155d