New protocol WK2x01

Protocol WK2x01 number 30
Sub protocols:
- WK2801 number 0, 8 channels, fixed id not supported
- WK2601 number 1, 6/7 channels, option is used see doc for details
- WK2401 number 2, 4 channels
Extended limits supported
Autobind protocol
Most receivers support WK2801 so always start trying this sub protocol
first.

Multiprotocol/Multiprotocol.h

@@ -56,6 +56,7 @@ enum PROTOCOLS
 	MODE_OPENLRS	= 27,	// =>OpenLRS hardware
 	MODE_AFHDS2A	= 28,	// =>A7105
 	MODE_Q2X2		= 29,	// =>NRF24L01, extension of CX-10 protocol
+	MODE_WK2x01		= 30,	// =>CYRF6936
 };
 
 enum Flysky
@@ -174,6 +175,12 @@ enum FY326
 	FY326	= 0,
 	FY319	= 1,
 };
+enum WK2x01
+{
+	WK2801	= 0,
+	WK2601	= 1,
+	WK2401	= 2,
+};
 
 #define NONE 		0
 #define P_HIGH		1
@@ -448,6 +455,7 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
 					OpenLRS		27
 					AFHDS2A		28
 					Q2X2		29
+					WK2x01		30
    BindBit=>		0x80	1=Bind/0=No
    AutoBindBit=>	0x40	1=Yes /0=No
    RangeCheck=>		0x20	1=Yes /0=No
@@ -535,6 +543,10 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
 		sub_protocol==FY326
 			FY326		0
 			FY319		1
+		sub_protocol==WK2x01
+			WK2801		0
+			WK2601		1
+			WK2401		2
 
    Power value => 0x80	0=High/1=Low
   Stream[3]   = option_protocol;