[Bug 248352] mfi: remove raid map sync functionality

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248352

            Bug ID: 248352
           Summary: mfi: remove raid map sync functionality
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: chandrakanth.patil at broadcom.com

Created attachment 216866
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=216866&action=edit
This patch removes raid map sync functionality from mfi driver

We have found a raid map sync failure in invader (device id: 5d) as soon as the
<mfi> driver is loaded. This is due to the failure in fetching updated raid map
from the firmware as raid map is logically unsupported in driver reason being
driver is not getting any raid map data as part of MFI_DCMD_LD_MAP_GET_INFO
instead it is getting the config seq number as part of MFI_DCMD_LD_GET_LIST
DCMD resulted in raid map sync failure. Below is the firmware log snippet where
there is a config sequence number mismatch between driver and firmware:

C0:ld sync: non-matching seqNums 1
C0:ld sync: 01 unsync'd lds remaining

This issue applies to the controllers which has a raid map support like
Thunderbolt (device id: 5b) invader (device id: 5d) and fury (device id: 5f)
controllers and it is not applicable to till Liberator (Gen1 and Gen2) as these
controllers don't have a raid map support.

Hence, We propose to remove the raid map sync functionality from <mfi> driver.
I have attached the sample patch covers raid map sync functionality removal
part and hasn't covered any test cases and it is just for reference.

If it looks feasible to remove raid map sync support from driver then please
consider my patch.

Note: we are not seeing this issue with <mrsas> driver.

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