Drive the LED_PWM line of the left half via TPM which doesn't work yet for some reason. Add protocol command for setting the LED_PWM brightness of the left half. Expose UpdateUsbReports()

right/src/usb_protocol_handler.c

@@ -207,8 +207,10 @@ void applyConfig()
 
 void setLedPwm()
 {
-    uint8_t brightnessPercent = GenericHidInBuffer[1];
 #if UHK_PCB_MAJOR_VERSION == 7
+    uint8_t brightnessPercent = GenericHidInBuffer[1];
     LedPwm_SetBrightness(brightnessPercent);
+    uint8_t data[] = {2, brightnessPercent};
+    I2cWrite(I2C_MAIN_BUS_BASEADDR, I2C_ADDRESS_LEFT_KEYBOARD_HALF, data, sizeof(data));
 #endif
 }