fix: remove target in rust-toolchain.toml

Signed-off-by: guttatus <xingzhiang2020@gmail.com>

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
+profile = "minimal"
 channel = "nightly-2025-02-08"
 components = ["rustfmt", "llvm-tools-preview", "clippy", "rust-src"]
-targets = ["riscv64imac-unknown-none-elf"]
-profile = "minimal"
+# targets = ["riscv64imac-unknown-none-elf"]