Add AI64 pinmux spreadsheet

Original from benedict.hewson (https://forum.beagleboard.org/t/bbai-64-pinmux-spreedsheet/32418/6)

Add AI64 pinmux spreadsheet
Original from benedict.hewson (https://forum.beagleboard.org/t/bbai-64-pinmux-spreedsheet/32418/6)
a70f7bc6 · Deepak Khatri · f146a5d5 · a70f7bc6
Commit a70f7bc6 authored 2 years ago by Deepak Khatri
--- a/boards/beaglebone/ai-64/bbai64-pinmux.ods
+++ b/boards/beaglebone/ai-64/bbai64-pinmux.ods