fix: remove P20 forward patch — cascading context issues with P16-1

x2APIC ICR mode fix cannot be a forward patch because P16-1-sipi-timing
references the ICR line as context. Modifying P1 (which introduces the line)
would require updating P16-1's offsets. Will address by consolidating into
an existing early patch in a future revision.

recipes/core/kernel/recipe.toml

@@ -34,7 +34,6 @@ patches = [
     "../../../local/patches/kernel/P17-3-sched-affinity.patch",
     "../../../local/patches/kernel/P17-3-syscall-dispatch.patch",
     "../../../local/patches/kernel/P19-2-irq-debug.patch",
-    "../../../local/patches/kernel/P20-x2apic-icr-mode-fix.patch",
 ]
 
 [build]