[pinmux] Enhance chip_sw_sleep_pin_wake chip-level test

[GregAC]

From the test description:

https://github.com/lowRISC/opentitan/blob/9cfe4e4a272953420648899ce49ed186024507a8/hw/top_earlgrey/data/chip_testplan.hjson#L436-L438

The described enhancements should be done as wake from sleep is an important feature.

estimate 8

[GregAC]

estimate range: 4 - 8

[johngt]

Assigning currently to @GregAC . Please forward assign to the most appropriate person.

[msfschaffner]

This looks like a TLT coverage enhancement for V3, hence I think it is ok to do this after M2.5.2.

[andreaskurth]

Proposing to move to M7 as part of V3 work