kernel/prism: Update GPIOs for Chameleon EVT2

Add support for Dying Gasp.
Add reset button support and invert polarity.
Add GPON-specific TX_SD/TX_FAULT pins.

Change-Id: Ieb64e517f916672c404713c2444980ce475248e6
(cherry picked from commit 34d51d4b1b67fb9006b0e356eb2b5e2029513433)
1 file changed