fix: cpufreqd MSR spam, udev-shim PCI spam, scheme throttle, keymaps dir

- cpufreqd: suppress MSR errors after 1 failure (was 10)
- udev-shim: demote PCI scan failures from WARN to DEBUG
- accessibility/ime/keymapd: throttle EBADF loop with 100ms sleep
- config: create /etc/keymaps directory for keymapd

local/recipes/system/cpufreqd/source/src/main.rs

@@ -8,7 +8,7 @@ const IA32_PERF_CTL: u32 = 0x199;
 const POLL_MS: u64 = 100;
 const SAMPLE_WINDOW: usize = 10;
 const STATE_WRITE_INTERVAL_S: u64 = 1;
-const MSR_ERROR_SUPPRESS_COUNT: u32 = 10;
+const MSR_ERROR_SUPPRESS_COUNT: u32 = 1;
 const THERMAL_CACHE_MS: u64 = 1000;
 
 #[derive(Clone, Copy, PartialEq, Debug)]