Enable CONFIG_KSU_MANUAL_HOOK for KSUN build variant

[google-labs-jules]

The KSUN build variant applies the syscall_hooks.patch, which requires CONFIG_KSU_MANUAL_HOOK=y to be effective when CONFIG_KSU_KPROBES_HOOK is disabled. Previously, this configuration was only applied to the RKSU variant.

This change updates the workflow logic to enable CONFIG_KSU_MANUAL_HOOK for KSUN as well.

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PR created automatically by Jules for task 178431655630725824 started by @ctrlpaste

[google-labs-jules]

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