Add archfile var and use proper getty for ppc64le

Closed Carlo Landmeter requested to merge github/fork/mtarsel/ppc64le-console-fix into master

Created by: mtarsel

On ppc64le when net botting Alpine, we will not get a login prompt from Petitboot. This patch will set TTY as /dev/console and the TERMTYPE as vt100 while using a safer BAUD value in order work on varying ppc64le hardware. Additionally I create a archfile variable which is also used to silently fix the apk arch in case the apkovl does not match.

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