Bump aarch64-rt from 0.2.2 to 0.3.0

[dependabot]

Bumps aarch64-rt from 0.2.2 to 0.3.0.

Changelog

Sourced from aarch64-rt's changelog.

0.3.0

Breaking changes

• Changed order of parameters to initial-pagetable macro, to make TCR last.

Improvements

• If the initial-pagetable or exceptions features are specified without any of the elX features, then the exception level will be checked at runtime and the appropriate registers for the current EL will be used. The el1 feature is no longer enabled by default, as this runtime detection should work instead. Note that different ELs have different TCR registers which aren't laid out entirely the same, so different values must be specified for TCR for each EL.
• Exposed enable_mmu! macro to allow the MMU and caches to be enbled with an arbitrary initial pagetable, rather than using initial_pagetable! to declare the static.

Bugfixes

• Stopped exposing unmangled symbols for set_exception_vector and rust_entry.

Commits

• c3d995d Prepare for 0.3.0 release.
• fde06f8 Merge pull request #27 from google/pagetable
• 3980680 Switch registers to match order of parameters.
• 52a4d09 Separate default TCR values for different exception levels.
• be1f771 Allow enable_mmu! macro to be used directly.
• f533807 Pass symbol for pagetable rather than setting export name.
• da55ff9 Support detecting exception level at runtime (#26)
• 51720a0 Use Rust code to switch on exception level for vector table.
• b9a90da Move private public symbols to __private submodule.
• 6255fd6 Hide functions to enable MMU.
• Additional commits viewable in compare view

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