Read and parse OTP on the BCM4378. There are quite a few firmware and

Read and parse OTP on the BCM4378.  There are quite a few firmware and
nvram files used for the different Apple devices.  The device tree and
the OTP hold the information which of those we will have to use.  For
now this information will simply be printed, but depending on how we
choose to do the firmare distribution we could use it for loadfirmware().