unconditionally depend on atomic-polyfill for riscv32i target

Author: japaric

Cargo.toml

@@ -31,7 +31,7 @@ defmt-impl = ["defmt"]
 atomic-polyfill = { version = "0.1.2", optional = true }
 
 [target.riscv32i-unknown-none-elf.dependencies]
-atomic-polyfill = { version = "0.1.4", optional = true }
+atomic-polyfill = { version = "0.1.4" }
 
 [target.riscv32imc-unknown-none-elf.dependencies]
 atomic-polyfill = { version = "0.1.4", optional = true }