perf(config): make x86 preemption mode static

Disable dynamic preemption in the x86 firmware configuration so the
PREEMPT_NONE selection is compiled as the sole scheduling model.

Keep this change isolated for hardlink throughput and responsiveness
A/B testing before it is considered for the cumulative stack.

Author: appcypher

config-libkrunfw_x86_64

@@ -128,7 +128,7 @@ CONFIG_PREEMPT_NONE=y
 # CONFIG_PREEMPT_RT is not set
 CONFIG_PREEMPT_COUNT=y
 CONFIG_PREEMPTION=y
-CONFIG_PREEMPT_DYNAMIC=y
+# CONFIG_PREEMPT_DYNAMIC is not set
 # CONFIG_SCHED_CORE is not set
 
 #