meta-ibm/sbp1: Handle presence GPIOs

Mark static inventory items that only have a presence GPIO, but no
FRU EEPROM as present using phosphor-gpio-monitor.

This will be used by other OpenBMC systems

meta-ibm/sbp1: Handle presence GPIOs

Mark static inventory items that only have a presence GPIO, but no
FRU EEPROM as present using phosphor-gpio-monitor.

This will be used by other OpenBMC systems to determine the
presence of FRU devices and to run additional services.

Tested: Inventory on SBP1 is properly updated according to GPIOs.

Change-Id: I7f83bf82625a86c23fd0781ebe2d415cf486dadb
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>

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