Correcting defaults for min and max sensor bounds

Hardcoded (-127,128) seems wrong to me
Using (-128,127) which I think was the intention
This matches what a signed byte would be

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Ia0f1e7b25b673be50593e2cc056c69f3bb0b76cd
1 file changed