fix bugs #207

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2 errors and 11 warnings

Process completed with exit code 1.

The action 'simulate' has timed out after 2 minutes.

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

constant `CONFIGURE_CLK_MAGIC` is never used

constant `CONFIGURE_CLK_SHIFT` is never used

unused import: `println`

unnecessary parentheses around `if` condition

unused imports: `cap_reply_cap`, `mdb_node`

unused import: `cte_insert`

unused import: `possible_switch_to`

unused import: `sched_context::sched_context_t`

the item `sched_context_t` is imported redundantly

unused import: `types_gen::seL4_Fault_tag::seL4_Fault_NullFault`