runtime/fireface: add static lifetime for trait local variable

This commit suppresses the following warning reported by rustc version 1.75.

warning: `&` without an explicit lifetime name cannot be used here
    ...
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #115010 <rust-lang/rust#115010>
    = note: `#[warn(elided_lifetimes_in_associated_constant)]` on by default
help: use the `'static` lifetime
Signed-off-by: Takashi Sakamoto <[email protected]>

Author: takaswie

runtime/fireface/src/latter_ctls.rs

@@ -3354,13 +3354,13 @@ where
         + RmeFfWhollyCommandableParamsOperation<FfLatterFxEchoState>
         + RmeFfPartiallyCommandableParamsOperation<FfLatterFxEchoState>,
 {
-    const ECHO_TYPES: &[FfLatterFxEchoType] = &[
+    const ECHO_TYPES: &'static [FfLatterFxEchoType] = &[
         FfLatterFxEchoType::StereoEcho,
         FfLatterFxEchoType::StereoCross,
         FfLatterFxEchoType::PongEcho,
     ];
 
-    const ECHO_LPF_FREQS: &[FfLatterFxEchoLpfFreq] = &[
+    const ECHO_LPF_FREQS: &'static [FfLatterFxEchoLpfFreq] = &[
         FfLatterFxEchoLpfFreq::Off,
         FfLatterFxEchoLpfFreq::H2000,
         FfLatterFxEchoLpfFreq::H4000,