[Autel update] Add GM Ford Chrysler VW Toyota up to April 2021

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Autel Tablet update
EXPANDED DIAGNOSTIC SUPPORT FOR ALL MAXISYS TABLETS:
• GM (up to April 2021), Ford & Mazda (up to April 2021), Chrysler (up to April 2021), Volkswagen (up to April 2021), BMW (up to March 2021), Toyota (up to April 2021), Nissan (up to April 2021), Porsche (up to March 2020)
UPDATES FOR ULTRA SERIES:
• NEW More Accurate Topology for BMW, GM, Benz, Ford & Chrysler Vehicles
• Faster Programming Speed of BMW's EVO Host & MGU Host
UPDATES FOR MS908 & MS906 SERIES: 
• DPF, Brake Bleed, Sensor Initialization & More Added for Mazda