arm: dts: mt7623: increase passive cooling trip

MT7623/BPI-R2 has idle temperature after bootup from 48 degrees celsius
increase the passive trip temp threshold to not trottle CPU frequency at
this temperature

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20210725163451.217610-1-linux@fw-web.de


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>