transceivers: clear module disable when a module is removed

[Aaron-Hartwig]

Building on the module disabling feature introduced in #1441, this PR lets that disable get cleared when a disabled module is removed. Now the SP will enable power at the port again, so when a module is inserted it will get powered without intervention from the host.

This resolves #1480.

[Aaron-Hartwig]

I have tested this locally. I manually introduced NAKs by shorting SCL to GND. Here is a ringbuf upon a module being disabled:

humility: ring buffer drv_transceivers_server::__RINGBUF in transceivers:
 NDX LINE      GEN    COUNT PAYLOAD
   0  614        1       39 FrontIOBoardReady(false)
   1  604        1        1 FrontIOBoardReady(true)
   2  647        1        1 LEDInit
   3  150        1        1 LEDInitComplete
   4  533        1        1 ModulePresenceUpdate(LogicalPortMask(0x10001))
   5  354        1        4 GetInterfaceError(0x0, NotInitialized)
   6  313        1        1 GotInterface(0x0, Sff8636)
   7  448        1        3 TemperatureReadError(0x0, I2cAddressNack)
   8  477        1        1 DisablingPorts(LogicalPortMask(0x1))
   9  388        1        1 RemovedDisabledModuleThermalModel(0x0)

Then when I remove the module

humility: ring buffer drv_transceivers_server::__RINGBUF in transceivers:
 NDX LINE      GEN    COUNT PAYLOAD
   0  614        1       39 FrontIOBoardReady(false)
   1  604        1        1 FrontIOBoardReady(true)
   2  647        1        1 LEDInit
   3  150        1        1 LEDInitComplete
   4  533        1        1 ModulePresenceUpdate(LogicalPortMask(0x10001))
   5  354        1        4 GetInterfaceError(0x0, NotInitialized)
   6  313        1        1 GotInterface(0x0, Sff8636)
   7  448        1        3 TemperatureReadError(0x0, I2cAddressNack)
   8  477        1        1 DisablingPorts(LogicalPortMask(0x1))
   9  388        1        1 RemovedDisabledModuleThermalModel(0x0)
  10  529        1        1 ClearDisabledPorts(LogicalPortMask(0x1))
  11  533        1        1 ModulePresenceUpdate(LogicalPortMask(0x10000))