[SRU][F:linux-bluefield][PATCH v1 0/1] UBUNTU: SAUCE: i2c-mlxbf.c: fix wrong variable name

[Asmaa Mnebhi]

Buglink: https://bugs.launchpad.net/bugs/1982357

SRU Justification:

[Impact]

We are using the wrong variable name priv->smbus->io instead of priv->mst_cause->io. This could result in unexpected i2c behavior.

[Fix]

* replace priv->smbus->io with priv->mst_cause->io

[Test Case]

* Make sure the i2c-mlxbf.c driver is loaded and /dev/i2c-1 is created
* check that ipmitool from the BF->BMC and from the BMC->BF work (this only applies on boards with a BMC of course)

[Regression Potential]

Any of the test cases above could be impacted due to these changes.