Existing methods regFileReader.LogicalRemaining and regFileReader.PhysicalRemaining have inconsistent reciever names with the previous name

Change-Id: Ief2024716737eaf482c4311f3fdf77d92801c36e
Reviewed-on: https://go-review.googlesource.com/76430Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>