remove 82_show_temp to resolve r2s start up problems (#5656)

target/linux/rockchip/armv8/base-files/lib/preinit/82_show_temp

-sed -i "/<%:Load Average%>/i\\\t\t<tr><td width="33%"><%:CPU Temperature%></td><td><%=luci.sys.exec(\"cut -c1-3 /sys/class/thermal/thermal_zone0/temp | awk '{print \$1/10.0}'\")%>℃</td></tr>" /usr/lib/lua/luci/view/admin_status/index.htm
-rm /lib/preinit/82_show_temp