fix(X6000FB): Don't set brightness scratch register

[Why]
The driver is already doing this, we're interfering with the driver.

NootedRed/X6000FB.cpp

@@ -183,9 +183,6 @@ bool X6000FB::processKext(KernelPatcher &patcher, size_t id, mach_vm_address_t s
         MachInfo::setKernelWriting(false, KernelPatcher::kernelWriteLock);
         DBGLOG("X6000FB", "Applied DDI Caps patches");
 
-        this->biosScratchReg = NRed::callback->getVBIOSDataTable<AtomFirmwareInfo>(0x4)->biosScratchRegStartAddr;
-        DBGLOG("X6000FB", "BIOS Scratch Reg = 0x%X", this->biosScratchReg);
-
         return true;
     }
 
@@ -341,24 +338,16 @@ IOReturn X6000FB::wrapSetAttributeForConnection(IOService *framebuffer, IOIndex
         // dc_link_set_backlight_level_nits doesn't print the new backlight level, so we'll do it
         DBGLOG("X6000FB", "setAttributeForConnection: New AUX brightness: %d millinits (%d nits)", auxValue,
             (auxValue / 1000));
-        // Save the brightness value so the driver can restore it on its own on some specific occasions.
-        // For instance, when waking from sleep.
-        NRed::callback->writeReg32(callback->biosScratchReg + 2, auxValue);
         success = callback->orgDcLinkSetBacklightLevelNits(callback->embeddedPanelLink, true, auxValue, 15000);
     } else {
         UInt32 pwmValue = percentage >= 100 ? 0x1FF00 : ((percentage * 0xFF) / 100) << 8U;
         DBGLOG("X6000FB", "setAttributeForConnection: New PWM brightness: 0x%X", pwmValue);
-        // Ditto.
-        NRed::callback->writeReg32(callback->biosScratchReg + 2, pwmValue);
         success = callback->orgDcLinkSetBacklightLevel(callback->embeddedPanelLink, pwmValue, 0);
     }
 
-    if (success) {
-        return kIOReturnSuccess;
-    } else {
-        DBGLOG("X6000FB", "Failed to set backlight level");
-        return kIOReturnDeviceError;
-    }
+    if (success) { return kIOReturnSuccess; }
+
+    return kIOReturnDeviceError;
 }
 
 IOReturn X6000FB::wrapGetAttributeForConnection(IOService *framebuffer, IOIndex connectIndex, IOSelect attribute,

NootedRed/X6000FB.hpp

@@ -22,7 +22,6 @@ class X6000FB {
 
     private:
     mach_vm_address_t orgSetAttributeForConnection {0}, orgGetAttributeForConnection {0};
-    UInt32 biosScratchReg {0};
     UInt32 curPwmBacklightLvl {0}, maxPwmBacklightLvl {0xFFFF};
     UInt32 maxOLED {1000 * 512};
     void *embeddedPanelLink {nullptr};