DualSense Edge controller support

[QuarkZ26]

DualSense Edge controller doesn't seem to be detected, though it works in Steam and AntiMicroX. Would be nice to have that support even without the extra button.

[C0rn3j]

Added experimental support in 5295198 using linux and retrodeck sources.

I do not have the controller to test with, so this is very much a YOLO.

The extra buttons are currently not supported at all:

/* DualSense Edge extra buttons in buttons[2], bits 4-7. */
#define DS_EDGE_BUTTONS_FN1		BIT(4)
#define DS_EDGE_BUTTONS_FN2		BIT(5)
#define DS_EDGE_BUTTONS_LEFT_PADDLE	BIT(6)
#define DS_EDGE_BUTTONS_RIGHT_PADDLE	BIT(7)

Please check how it works on the current git master.