Add support for AM43 Blinds

[devbis]

https://github.com/TheBazeman/A-OK-AM43-Blinds-Drive
https://github.com/binsentsu/am43-ctrl

[Blind]# list-attributes 
Primary Service (Handle 0x5270)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service0001
  00001801-0000-1000-8000-00805f9b34fb
  Generic Attribute Profile
Characteristic (Handle 0x8b34)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service0001/char0002
  00002a05-0000-1000-8000-00805f9b34fb
  Service Changed
Descriptor (Handle 0x0015)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service0001/char0002/desc0004
  00002902-0000-1000-8000-00805f9b34fb
  Client Characteristic Configuration
Primary Service (Handle 0x6920)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service000c
  0000fe50-0000-1000-8000-00805f9b34fb
  Google Inc.
Characteristic (Handle 0xaac4)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service000c/char000d
  0000fe51-0000-1000-8000-00805f9b34fb
  SRAM 
Descriptor (Handle 0x0015)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service000c/char000d/desc000f
  00002902-0000-1000-8000-00805f9b34fb
  Client Characteristic Configuration
Characteristic (Handle 0xad28)
  /org/bluez/hci0/dev_02_F6_21_7E_10_96/service000c/char0010
  0000fe52-0000-1000-8000-00805f9b34fb
  SetPoint Medical

[devbis]

Added in ba61cce