int __init sh64_cache_init ( void);
This is pretty much just a straightforward clone of the SH detect_cpu_and_cache_system.
This function is responsible for setting up all of the cache info dynamically as well as taking care of CPU probing and setting up the relevant subtype data.
For the time being, we only really support the SH5-101 out of the box, and don't support dynamic probing for things like the SH5-103 or even cut2 of the SH5-101. Implement this later!