defconfig: use voluntary preemption

It seems to be that this is very close to not preempted and still has better
throughput than forced preemption.

Author: xdevs23

arch/x86/configs/nitrous_defconfig

@@ -7,7 +7,7 @@ CONFIG_POSIX_MQUEUE=y
 # CONFIG_USELIB is not set
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
-CONFIG_PREEMPT=y
+CONFIG_PREEMPT_VOLUNTARY=y
 CONFIG_IRQ_TIME_ACCOUNTING=y
 CONFIG_BSD_PROCESS_ACCT=y
 CONFIG_BSD_PROCESS_ACCT_V3=y
@@ -16,7 +16,6 @@ CONFIG_TASK_IO_ACCOUNTING=y
 CONFIG_PSI=y
 CONFIG_RCU_EXPERT=y
 CONFIG_RCU_FAST_NO_HZ=y
-CONFIG_RCU_BOOST=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_UCLAMP_TASK=y
@@ -2906,7 +2905,6 @@ CONFIG_IR_SERIAL_TRANSMITTER=y
 CONFIG_IR_SIR=m
 CONFIG_RC_XBOX_DVD=m
 CONFIG_CEC_CROS_EC=m
-CONFIG_CEC_GPIO=m
 CONFIG_USB_PULSE8_CEC=m
 CONFIG_USB_RAINSHADOW_CEC=m
 CONFIG_MEDIA_SUPPORT=m
@@ -3956,7 +3954,6 @@ CONFIG_USB_IDMOUSE=m
 CONFIG_USB_FTDI_ELAN=m
 CONFIG_USB_APPLEDISPLAY=m
 CONFIG_USB_SISUSBVGA=m
-CONFIG_USB_SISUSBVGA_CON=y
 CONFIG_USB_LD=m
 CONFIG_USB_TRANCEVIBRATOR=m
 CONFIG_USB_IOWARRIOR=m
@@ -5366,7 +5363,6 @@ CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x0
 CONFIG_DEBUG_WX=y
 CONFIG_SCHED_STACK_END_CHECK=y
 CONFIG_HARDLOCKUP_DETECTOR=y
-# CONFIG_DEBUG_PREEMPT is not set
 CONFIG_RCU_CPU_STALL_TIMEOUT=60
 CONFIG_LATENCYTOP=y
 CONFIG_STACK_TRACER=y