Kernel/Graphics: Export DDC I2C address definition to global header file

Kernel/Graphics/Definitions.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ * Copyright (c) 2021-2022, Liav A. <liavalb@hotmail.co.il>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -31,5 +31,7 @@ struct Modesetting {
     Timings horizontal;
     Timings vertical;
 };
+// Note: Address 0x50 is expected to be the DDC2 (EDID) i2c address.
+static constexpr u8 ddc2_i2c_address = 0x50;
 
 }

Kernel/Graphics/Intel/NativeDisplayConnector.cpp

@@ -351,8 +351,8 @@ void IntelNativeDisplayConnector::gmbus_read_edid()
     Array<u8, 128> crt_edid_bytes {};
     {
         SpinlockLocker control_lock(m_control_lock);
-        MUST(m_gmbus_connector->write(DDC2_I2C_ADDRESS, 0));
-        MUST(m_gmbus_connector->read(DDC2_I2C_ADDRESS, crt_edid_bytes.data(), crt_edid_bytes.size()));
+        MUST(m_gmbus_connector->write(Graphics::ddc2_i2c_address, 0));
+        MUST(m_gmbus_connector->read(Graphics::ddc2_i2c_address, crt_edid_bytes.data(), crt_edid_bytes.size()));
     }
     set_edid_bytes(crt_edid_bytes);
 }