gc0308: update sensor defaults according to Linux kernel driver

Author: mback2k

sensors/private_include/gc0308_settings.h

@@ -22,7 +22,7 @@ static const uint8_t gc0308_sensor_default_regs[][2] = {
     {0x11, 0x0d},
     {0x12, 0x2a},
     {0x13, 0x00},
-    {0x14, 0x11},
+    {0x14, 0x10}, // Linux kernel: CISCTL_MODE1 = 0x10 (no mirror/flip by default)
     {0x15, 0x0a},
     {0x16, 0x05},
     {0x17, 0x01},
@@ -56,12 +56,16 @@ static const uint8_t gc0308_sensor_default_regs[][2] = {
     {0x3d, 0x00},
     {0x3e, 0x00},
     {0x3f, 0x00},
-    {0x50, 0x14}, // 0x14
+    {0x50, 0x14}, // GLOBAL_GAIN = 0x14 (default gain)
     {0x52, 0x41},
     {0x53, 0x80},
     {0x54, 0x80},
     {0x55, 0x80},
     {0x56, 0x80},
+    // AWB Gain initialization (from Linux kernel driver)
+    {0x5a, 0x56}, // AWB_R_GAIN: Red gain for auto white balance
+    {0x5b, 0x40}, // AWB_G_GAIN: Green gain for auto white balance
+    {0x5c, 0x4a}, // AWB_B_GAIN: Blue gain for auto white balance
     {0x8b, 0x20},
     {0x8c, 0x20},
     {0x8d, 0x20},