Denylist com.google.pixel.camera.hal.manifest

This is an internal-only genrule, that was previously included in
a denylist in vendor/google/build. However, not all partners have
that file, so some products ended up setting
BUILD_BROKEN_GENRULE_SANDBOXING when that file didn't exist. Moving
it to the aosp allowlist lets us remove those build broken flags.

I checked with krzysio@ and yromanenko@ and they're ok with putting
this name in aosp.

Bug: 307824623
Test: Presubmits
Change-Id: Ia3f24a5c8c8efc62bdc84435343cafd1dac9afed