Remove USE_RTC6705_CLK_HACK.

For hardware SPI the GPIO pin is in Alternate Function mode, so setting
the bit in BSRR (via IOHi) won't have any affect on the IO level.

src/main/drivers/vtx_rtc6705.c

@@ -55,14 +55,7 @@ static busDevice_t busInstance;
 static busDevice_t *busdev;
 
 #define DISABLE_RTC6705()   IOHi(busdev->busdev_u.spi.csnPin)
-
-#ifdef USE_RTC6705_CLK_HACK
-static IO_t vtxCLKPin       = IO_NONE;
-// HACK for missing pull up on CLK line - drive the CLK high *before* enabling the CS pin.
-#define ENABLE_RTC6705()    {IOHi(vtxCLKPin); delayMicroseconds(5); IOLo(busdev->busdev_u.spi.csnPin); }
-#else
 #define ENABLE_RTC6705()    IOLo(busdev->busdev_u.spi.csnPin)
-#endif
 
 #define DP_5G_MASK          0x7000 // b111000000000000
 #define PA5G_BS_MASK        0x0E00 // b000111000000000
@@ -113,16 +106,6 @@ bool rtc6705IOInit(const vtxIOConfig_t *vtxIOConfig)
     rtc6705HaveRequiredResources = rtc6705HaveRequiredResources && vtxPowerPin;
 #endif
 
-#ifdef USE_RTC6705_CLK_HACK
-    SPIDevice device = SPI_CFG_TO_DEV(vtxIOConfig->spiDevice);
-    spiDevice_t *spi = &(spiDevice[device]);
-
-    vtxCLKPin = IOGetByTag(spi->sck);
-    // we assume the CLK pin will have been initialised by the SPI code.
-
-    rtc6705HaveRequiredResources = rtc6705HaveRequiredResources && vtxCLKPin;
-#endif
-
     if (!rtc6705HaveRequiredResources) {
         return false;
     }

src/main/target/SPRACINGF3NEO/target.h

@@ -101,9 +101,6 @@
 #define RTC6705_SPI_INSTANCE    SPI3
 #define RTC6705_POWER_PIN       PC3
 
-#define USE_RTC6705_CLK_HACK
-#define RTC6705_CLK_PIN         SPI3_SCK_PIN
-
 #define USE_MAX7456
 #define MAX7456_SPI_INSTANCE    SPI3
 #define MAX7456_SPI_CS_PIN      PA15

src/main/target/SPRACINGF4NEO/target.h

@@ -147,9 +147,6 @@
 #define RTC6705_SPI_INSTANCE                SPI3
 #define RTC6705_POWER_PIN                   PC3
 
-#define USE_RTC6705_CLK_HACK
-#define RTC6705_CLK_PIN                     SPI3_SCK_PIN
-
 // Bus Switched Device, Device A.
 #define USE_MAX7456
 #define MAX7456_SPI_INSTANCE                SPI3