Add Hygon Dhyana support

hygonsocrequested to merge
hygonsoc/cmake:master into master

This patch add Hygon Dhyans support:

  • add Hygon CPU Vendor ID("HygonGenuine") detection
  • add HasMMXPlus CPU flag checking

Signed-off-by: Fan Jinke fanjinke@hygon.cn

Edited by hygonsoc

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