Add support PTX Smart Single Wall Switch(090615.switch.x6kw1)

[qjrxsoft02]

from custom_components.xiaomi_gateway3.core.devices import *

DEVICES = [{
   # https://home.miot-spec.com/spec?type=urn:miot-spec-v2:device:switch:0000A003:090615-x6kw1:1:0000C808
    11652: ["PTX", "Smart Single Wall Switch", "PTX-X61-NMIMC1", "090615.switch.x6kw1"],
    "spec": [
        BaseConv("switch", "switch", mi="2.p.1"),
        BaseConv("backlight", "switch", mi="9.p.1"), # config
        BoolConv("wireless", "switch", mi="2.p.2"),
        BaseConv("action", "sensor"),
        ConstConv("action", mi="8.e.1", value=BUTTON_SINGLE),
        ConstConv("action", mi="8.e.2", value=BUTTON_HOLD),
}] + DEVICES