fby35: ji: Add retimer fault gpio pin interrupt

[ArthurTu0624]

Summary:

• Support VIRTUAL_RETIMER_PG gpio pin interrupt
  • While CPU on, FLAG=false, RETIMER_PG from 1 to 0
    ASSERT, FLAG set to true
  • While CPU on, FLAG=true, RETIMER_PG from 0 to 1
    DEASSERT, FLAG set to false
  • While CPU power off
    FLAG set to false

TestPlan:

• BuildCode: PASS
• If trigger interrupt, send SEL log: PASS

Log:

• BMC log:

1    slot1    2018-03-09 04:41:14    ipmid            SEL Entry: FRU: 1, Record: Standard (0x02), Time: 2018-03-09 04:41:14, Sensor: SYSTEM_STATUS (0x10), Event Data: (17FFFF) Retimer fault Assertion
1    slot1    2018-03-09 04:41:29    ipmid            SEL Entry: FRU: 1, Record: Standard (0x02), Time: 2018-03-09 04:41:29, Sensor: SYSTEM_STATUS (0x10), Event Data: (17FFFF) Retimer fault Deassertion

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This pull request has been merged in 4d2dc0a.