libcamera2: add hardwareLevel to camera metadata

Technically, this is only required for v3 and higher devices, and this
is a v2 device.  There aren't any other v2 devices, so our framework
logic just treats them the same.  Adding this metadata entry puts this
device back as a first-class full (v3) device in the framework.

Bug: 9261359
Change-Id: I4ba91c5689fd17d4a3f2044fae1c39dd9ee625df
1 file changed