x86/64: enable virtualization support for spinlocks to improve kvm performance

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/x86/64/config-default

@@ -1,7 +1,6 @@
 CONFIG_64BIT=y
 CONFIG_ACPI=y
 CONFIG_ACPI_AC=y
-# CONFIG_ACPI_ALS is not set
 CONFIG_ACPI_BATTERY=y
 CONFIG_ACPI_BUTTON=y
 # CONFIG_ACPI_CMPC is not set
@@ -28,7 +27,6 @@ CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT=y
 CONFIG_ACPI_THERMAL=y
 # CONFIG_ACPI_VIDEO is not set
 # CONFIG_ACPI_WMI is not set
-# CONFIG_APPLE_GMUX is not set
 CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig"
 CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
@@ -48,7 +46,6 @@ CONFIG_AUDIT_ARCH=y
 CONFIG_BACKLIGHT_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_GENERIC=y
 CONFIG_BACKLIGHT_LCD_SUPPORT=y
-# CONFIG_BACKLIGHT_SAHARA is not set
 CONFIG_BLK_DEV_INTEGRITY=y
 CONFIG_CALGARY_IOMMU=y
 CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT=y
@@ -91,7 +88,6 @@ CONFIG_FONT_SUPPORT=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 # CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY is not set
 # CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
-# CONFIG_FUJITSU_LAPTOP is not set
 CONFIG_GART_IOMMU=y
 CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y
 CONFIG_GENERIC_CPU=y
@@ -153,11 +149,10 @@ CONFIG_NLS=y
 CONFIG_NR_CPUS=8
 # CONFIG_NUMA is not set
 CONFIG_OUTPUT_FORMAT="elf64-x86-64"
-# CONFIG_PANASONIC_LAPTOP is not set
 CONFIG_PARAVIRT=y
 CONFIG_PARAVIRT_CLOCK=y
 # CONFIG_PARAVIRT_DEBUG is not set
-# CONFIG_PARAVIRT_SPINLOCKS is not set
+CONFIG_PARAVIRT_SPINLOCKS=y
 # CONFIG_PARAVIRT_TIME_ACCOUNTING is not set
 CONFIG_PCIEAER=y
 CONFIG_PCIEPORTBUS=y