coresight: platform: acpi: Ignore the absence of graph

mainline inclusion
from mainline-v6.5-rc1
commit 3a2888aa
category: Bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I89TNS
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3a2888aa1f962c55ca36119aebe67355c7bf54e4



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Some components may not have graph connections for describing
the trace path. e.g., ETE, where it could directly use the per
CPU TRBE. Ignore the absence of graph connections

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20230710062500.45147-6-anshuman.khandual@arm.com


Signed-off-by: Junhao He <hejunhao3@huawei.com>