arch/x86: all x86 but i386 has atomics operations

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Anton Kolesov <Anton.Kolesov@synopsys.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

arch/Config.in.x86

@@ -202,6 +202,9 @@ config BR2_ARCH
 config BR2_ENDIAN
 	default "LITTLE"
 
+config BR2_ARCH_HAS_ATOMICS
+	default y if !BR2_x86_i386
+
 config BR2_GCC_TARGET_TUNE
 	default "i386"		if BR2_x86_i386
 	default "i486"		if BR2_x86_i486