ARM: dts: msm: Remove PDC mapping for GPIO87 for Kona

GPIO87 from eSoC MDM triggers an additional interrupt, when enabled at  
the PDC, causing modem boot failures. Since the GPIO is not needed for a
wakeup from CXPC, remove the GPIO-PDC mapping for Kona.

Change-Id: I89d6a76df0ee17b8c09697ae571d5078d9e65ba9