Fix Enclosure Mapping for early version Mini X 3.0 Systems

backport r-series enclosures fixes for 12.0-U4.1 release (#7112) · truenas/middleware@fb0389b (github.com)

Opening this because we will need the fix merged for 12.0-U4.1.

Branch yet to be defined.

12.0 PR: https://github.com/truenas/middleware/pull/7098

Tested on a hotpatched 12.0u4 Mini-X with 1.0 system version. Soon testing on a 1.1 system version with fixed wiring.

Secondary PR https://github.com/truenas/middleware/pull/7056