perf unwind: Use function to add missing maps lock

Switch read_unwind_spec_eh_frame() from loop macro
maps__for_each_entry() to maps__for_each_map() function that takes a
callback. The function holds the maps lock, which should be held during
iteration.

Committer notes:

Fixed up conflict with:

  4fb54994b2360ab5 ("perf unwind-libunwind: Fix base address for .eh_frame")

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Wenyu Liu <liuwenyu7@huawei.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: changbin du <changbin.du@huawei.com>
Cc: colin ian king <colin.i.king@gmail.com>
Cc: dmitrii dolgov <9erthalion6@gmail.com>
Cc: guilherme amadio <amadio@gentoo.org>
Cc: huacai chen <chenhuacai@kernel.org>
Cc: k prateek nayak <kprateek.nayak@amd.com>
Cc: li dong <lidong@vivo.com>
Cc: liam howlett <liam.howlett@oracle.com>
Cc: miguel ojeda <ojeda@kernel.org>
Cc: ming wang <wangming01@loongson.cn>
Cc: sean christopherson <seanjc@google.com>
Cc: vincent whitchurch <vincent.whitchurch@axis.com>
Link: http://lore.kernel.org/lkml/20231207011722.1220634-12-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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