Make Panic Handler Optional

[ivila]

In no-std branch, teaclave SDK define a panic handler, which stop ta developer from setting an custom one (for example, we would like to log the panic information before calling TEE_Panic).

incubator-teaclave-trustzone-sdk/optee-utee/src/lib.rs

Line 36 in 3177d4f

#[panic_handler]

I think we should add a feature flag to let developer choose if they really need to disable the default one, just like this issue: rust-osdev/uefi-rs: Make panic handler optional

[b49020]

Looks reasonable to me, feel free to create corresponding PR.

[ivila]

@b49020 Thanks for your patience, a PR has already created.

[ivila]

Done