Fixed doc build error in gen_symbol_vma on macOS

[equation314]

See https://github.com/arceos-org/arceos/actions/runs/23734525797/job/69135753043#step:4:430.

This implements gen_symbol_vma using PC-relative addressing on macOS. The test code (test_percpu.rs) can now be successfully compiled on macOS (arm64), but the executable file still cannot be generated due to lack of support for linker scripts.

[Copilot]

Pull request overview

This PR addresses a macOS documentation build failure related to gen_symbol_vma by avoiding problematic symbol-address generation on macOS and aligning linker symbol usage with addr_of!-based address taking.

Changes:

• Switch linker symbol declarations from extern "C" fn to extern "C" static and use core::ptr::addr_of! for section boundary arithmetic/copying.
• Update gen_symbol_vma to use a slower, PC-relative-safe address computation on macOS and keep the fast asm-based path for non-macOS.
• Remove the unused cfg-if dependency from percpu_macros, adjust test gating, and broaden the deploy workflow trigger.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
percpu/tests/test_percpu.rs	Adjusts cfg gating so sp-naive tests can build on non-Linux hosts.
percpu/src/imp.rs	Uses addr_of! + extern static for percpu linker symbols to avoid incorrect casts.
percpu_macros/src/arch.rs	Changes macOS symbol-VMA generation to avoid the fast asm path on macOS; updates symbol declaration style.
percpu_macros/Cargo.toml	Drops unused cfg-if dependency.
Cargo.lock	Removes cfg-if from the resolved dependency graph for percpu_macros.
.github/workflows/deploy.yml	Expands workflow triggers from main-only to all push/pull_request events.

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[aarkegz]

LGTM