ath79: teltonika-rut230: fix failsafe boot without SIM tray

ath79: teltonika-rut230: fix failsafe boot without SIM tray

Due to "SIM present" input defaulting to "button" type, it is
interpreted as such when booting, and causes the system to enter
failsafe, if the tray is missing. Similarly to rfkill switch on
TP-Link WDR4300 and Archer C7, make it EV_SW instead, to stop it from
interfering with the boot process.

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17503
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 7b9ca01109827368deb68b7d8217643b78b87cb9)