Add @qedawkins to a few CODEOWNERS directories (iree-org#17258)

I want to track changes to these directories so adding myself as
codeowner for them. Some of them are starting to receive more
contributions and/or are newer so this updates the default reviewer pool
for them.

.github/CODEOWNERS

@@ -59,8 +59,9 @@
 /compiler/src/iree/compiler/Codegen/ @MaheshRavishankar
 /compiler/src/iree/compiler/Codegen/Common @hanhanW @dcaballe
 /compiler/src/iree/compiler/Codegen/Common/GPU @antiagainst @qedawkins
+/compiler/src/iree/compiler/Codegen/Dialect/GPU @antiagainst @qedawkins
 /compiler/src/iree/compiler/Codegen/LLVMCPU/ @dcaballe @hanhanW @MaheshRavishankar
-/compiler/src/iree/compiler/Codegen/LLVMGPU/ @MaheshRavishankar
+/compiler/src/iree/compiler/Codegen/LLVMGPU/ @MaheshRavishankar @qedawkins
 /compiler/src/iree/compiler/Codegen/SPIRV/ @antiagainst @MaheshRavishankar
 /compiler/src/iree/compiler/Codegen/TransformStrategies/ @qedawkins @MaheshRavishankar
 /compiler/src/iree/compiler/ConstEval/ @hanhanW @stellaraccident
@@ -69,6 +70,7 @@
 /compiler/src/iree/compiler/Dialect/Vulkan/ @antiagainst
 /compiler/src/iree/compiler/GlobalOptimization/ @hanhanW
 /compiler/src/iree/compiler/InputConversion/ @MaheshRavishankar @stellaraccident
+/compiler/src/iree/compiler/Preprocessing/ @qedawkins @MaheshRavishankar
 /compiler/plugins/input/StableHLO/ @hanhanW @MaheshRavishankar @rsuderman
 /compiler/plugins/input/TOSA/ @MaheshRavishankar @rsuderman