rtc: remove dead SQW IRQ code
This was once introduced by commit 100d9891 but was never used in-tree and then got broken by commit 32e0c826. Time to clean up. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Message-id: 520B6A27.4040207@siemens.com Signed-off-by: NAnthony Liguori <aliguori@amazon.com>
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