x86_64: support HyperThreading and SMP with up to 8 CPUs

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 44232

target/linux/x86_64/config-default

@@ -332,7 +332,7 @@ CONFIG_NEED_SG_DMA_LENGTH=y
 CONFIG_NET_RX_BUSY_POLL=y
 CONFIG_NLS=y
 CONFIG_NO_BOOTMEM=y
-CONFIG_NR_CPUS=1
+CONFIG_NR_CPUS=8
 # CONFIG_NTB is not set
 CONFIG_NVRAM=y
 CONFIG_OPROFILE_NMI_TIMER=y
@@ -460,6 +460,7 @@ CONFIG_VT_HW_CONSOLE_BINDING=y
 CONFIG_WATCHDOG_CORE=y
 CONFIG_X86=y
 CONFIG_X86_64=y
+CONFIG_X86_64_SMP=y
 # CONFIG_X86_ACPI_CPUFREQ is not set
 # CONFIG_X86_CHECK_BIOS_CORRUPTION is not set
 CONFIG_X86_CMOV=y
@@ -468,6 +469,7 @@ CONFIG_X86_CMPXCHG64=y
 CONFIG_X86_DEBUGCTLMSR=y
 CONFIG_X86_DEV_DMA_OPS=y
 # CONFIG_X86_EXTENDED_PLATFORM is not set
+CONFIG_X86_HT=y
 # CONFIG_X86_INTEL_LPSS is not set
 # CONFIG_X86_INTEL_PSTATE is not set
 CONFIG_X86_INTERNODE_CACHE_SHIFT=6