toolchain: migrate to 1.94.0 toolchain

etc/aarch64-unknown-none.json

@@ -2,6 +2,7 @@
   "arch": "aarch64",
   "os": "none",
   "abi": "softfloat",
+  "rustc-abi": "softfloat",
   "llvm-target": "aarch64-unknown-none",
   "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32",
   "max-atomic-width": 128,

etc/riscv64-unknown-none.json

@@ -1,8 +1,8 @@
 {
   "arch": "riscv64",
   "os": "none",
-  "abi": "softfloat",
   "cpu": "generic-rv64",
+  "llvm-abiname": "lp64",
   "llvm-target": "riscv64",
   "data-layout": "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128",
   "max-atomic-width": 64,
@@ -20,7 +20,6 @@
 
   "crt-objects-fallback": "false",
   "emit-debug-gdb-scripts": false,
-  "llvm-abiname": "lp64",
 
   "linker": "rust-lld",
   "linker-flavor": "ld.lld"