arch: riscv: core: fpu: mark unused function argument

Use ARG_UNUSED() to mark unused function argument.

Signed-off-by: Gaetan Perrot <[email protected]>

Author: moonlight83340

arch/riscv/core/fpu.c

@@ -341,6 +341,9 @@ int arch_float_disable(struct k_thread *thread)
 
 int arch_float_enable(struct k_thread *thread, unsigned int options)
 {
+	ARG_UNUSED(thread);
+	ARG_UNUSED(options);
+
 	/* floats always gets enabled automatically at the moment */
 	return 0;
 }