soc: apple: sart: require device link for consumers

devm_apple_sart_get() obtains the supplier platform device and attempts
to create a runtime-PM device link to it, but it ignores device_link_add()
failure.  A consumer can then continue without the dependency that keeps
the SART supplier ordered and runtime-PM reachable.

Treat a failed device link as an error and drop the supplier device
reference before returning.

Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Link: https://patch.msgid.link/20260616005346.7862-1-pengpeng@iscas.ac.cn
Signed-off-by: Sven Peter <sven@kernel.org>

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