x86/net: only select BPF_JIT when NET is enabled

Fix kconfig unmet dependency warning: HAVE_BPF_JIT depends on NET, so
make the "select" of it depend on NET also.

warning: (X86) selects HAVE_BPF_JIT which has unmet direct dependencies (NET)
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/x86/Kconfig

@@ -72,7 +72,7 @@ config X86
 	select IRQ_FORCED_THREADING
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select ARCH_NO_SYSDEV_OPS
-	select HAVE_BPF_JIT if X86_64
+	select HAVE_BPF_JIT if (X86_64 && NET)
 
 config INSTRUCTION_DECODER
 	def_bool (KPROBES || PERF_EVENTS)