selftests/powerpc: Add missing PMU selftests to .gitignores

Some recently added selftests don't have their binaries in .gitignores,
so add them.

I also alphabetically sorted sampling_tests/.gitignore while I was in
there.
Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220812071632.56095-1-ruscur@russell.cc

tools/testing/selftests/powerpc/pmu/event_code_tests/.gitignore

+blacklisted_events_test
+event_alternatives_tests_p10
+event_alternatives_tests_p9
+generic_events_valid_test
+group_constraint_cache_test
+group_constraint_l2l3_sel_test
+group_constraint_mmcra_sample_test
+group_constraint_pmc56_test
+group_constraint_pmc_count_test
+group_constraint_radix_scope_qual_test
+group_constraint_repeat_test
+group_constraint_thresh_cmp_test
+group_constraint_thresh_ctl_test
+group_constraint_thresh_sel_test
+group_constraint_unit_test
+group_pmc56_exclude_constraints_test
+hw_cache_event_type_test
+invalid_event_code_test
+reserved_bits_mmcra_sample_elig_mode_test
+reserved_bits_mmcra_thresh_ctl_test

tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore

-mmcr0_exceptionbits_test
+bhrb_filter_map_test
+bhrb_no_crash_wo_pmu_test
+intr_regs_no_crash_wo_pmu_test
 mmcr0_cc56run_test
-mmcr0_pmccext_test
-mmcr0_pmcjce_test
+mmcr0_exceptionbits_test
 mmcr0_fc56_pmc1ce_test
 mmcr0_fc56_pmc56_test
+mmcr0_pmccext_test
+mmcr0_pmcjce_test
 mmcr1_comb_test
-mmcr2_l2l3_test
+mmcr1_sel_unit_cache_test
 mmcr2_fcs_fch_test
+mmcr2_l2l3_test
 mmcr3_src_test
+mmcra_bhrb_any_test
+mmcra_bhrb_cond_test
+mmcra_bhrb_disable_no_branch_test
+mmcra_bhrb_disable_test
+mmcra_bhrb_ind_call_test
+mmcra_thresh_cmp_test
 mmcra_thresh_marked_sample_test