x86/ucode/amd: Alter API for microcode_fits()

x86/ucode/amd: Alter API for microcode_fits()

Although it is logically a step in the wrong direction overall, it simplifies
the rearranging of cpu_request_microcode() substantially for microcode_fits()
to take struct microcode_header_amd directly, and not require an intermediate
struct microcode_amd pointing at it.

Make this change (taking time to rename 'mc_amd' to its eventual 'patch' to
reduce the churn in the series), and a later cleanup will make it uniformly
take a struct microcode_patch.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>