Migrate GenAI gqa attn splitk kernel arguments to use `PTA_B` #15434

Job	Run time
build_artifact (x86, linux.24xlarge, ubuntu:22.04, default, 3.13, 6.3, gcc)	44m 11s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, default, 3.13, 6.4, gcc)	41m 23s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, default, 3.13, 6.3, clang)	44m 32s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, genai, 3.13, 6.4, gcc)	2h 53m 38s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, genai, 3.13, 6.4, clang)	2h 54m 26s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, default, 3.13, 6.4, clang)	42m 52s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, genai, 3.13, 6.3, clang)	1h 15m 51s
build_artifact (x86, linux.24xlarge, ubuntu:22.04, genai, 3.13, 6.3, gcc)	1h 15m 29s
test_and_publish_artifact (x86, linux.rocm.gpu.2, default, 3.13, 6.4, clang)	21m 48s
test_and_publish_artifact (x86, linux.rocm.gpu.2, default, 3.13, 6.3, gcc)	1h 0m 19s
test_and_publish_artifact (x86, linux.rocm.gpu.2, genai, 3.13, 6.3, clang)	11m 1s
test_and_publish_artifact (x86, linux.rocm.gpu.2, default, 3.13, 6.3, clang)	22m 56s
test_and_publish_artifact (x86, linux.rocm.gpu.2, genai, 3.13, 6.4, gcc)	10m 11s
test_and_publish_artifact (x86, linux.rocm.gpu.2, default, 3.13, 6.4, gcc)	1h 17m 31s
test_and_publish_artifact (x86, linux.rocm.gpu.2, genai, 3.13, 6.3, gcc)	14m 42s
test_and_publish_artifact (x86, linux.rocm.gpu.2, genai, 3.13, 6.4, clang)	18m 14s
	15h 9m 4s

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