disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/tools/testing/selftests/powerpc/alignment/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 TEST_GEN_PROGS := copy_first_unaligned alignment_handler
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 top_srcdir = ../../../../..