device-nokia-n900: various fixes

See individual commits for explanations

device/community/device-nokia-n900/sxmo/deviceprofile.sh

-#!/bin/sh
-# SPDX-License-Identifier: AGPL-3.0-only
-# Copyright 2022 Sxmo Contributors
-
-export WLR_RENDERER=pixman
-export SXMO_LYSTI_LEDS=1
-export SXMO_POWER_BUTTON="0:0:twl_pwrbutton"
-export SXMO_TOUCHSCREEN_ID="TSC2005 touchscreen"
-export SXMO_SWAY_SCALE="1.5"
-#on N900 these two are swaped
-export SXMO_BEMENU_LANDSCAPE_LINES="10"
-export SXMO_BEMENU_PORTRAIT_LINES="8"
-export SXMO_DMENU_LANDSCAPE_LINES="10"
-export SXMO_DMENU_PORTRAIT_LINES="6"
-export SXMO_ROTATE_DIRECTION="left"
-export SXMO_KEYBOARD_SLIDER_EVENT_DEVICE="/dev/input/by-path/platform-gpio_keys-event"
-export SXMO_KEYBOARD_SLIDER_CLOSE_EVENT="*code 10 (SW_KEYPAD_SLIDE), value 0*"
-export SXMO_KEYBOARD_SLIDER_OPEN_EVENT="*code 10 (SW_KEYPAD_SLIDE), value 1*"
-# modem is only supported via ofono, not modemmanager
-export SXMO_NO_MODEM=1