arch/Config.in.arm: only enable BR2_ARM_CPU_HAS_ARM for ARMv8 in 32bit mode

Fixes:
http://autobuild.buildroot.net/results/5e6/5e67cc067a06f7364cde1a8393ea72608fe7fef1/

A number of packages use BR2_ARM_CPU_HAS_ARM to know if the target handles
classic A32 instructions, which is only true for ARMv8 cores when they are
running in 32bit mode.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

arch/Config.in.arm

@@ -193,21 +193,21 @@ config BR2_cortex_a17
 	depends on !BR2_ARCH_IS_64
 config BR2_cortex_a53
 	bool "cortex-A53"
-	select BR2_ARM_CPU_HAS_ARM
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
 	select BR2_ARM_CPU_HAS_NEON
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8
 	select BR2_ARCH_HAS_MMU_OPTIONAL
 config BR2_cortex_a57
 	bool "cortex-A57"
-	select BR2_ARM_CPU_HAS_ARM
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
 	select BR2_ARM_CPU_HAS_NEON
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8
 	select BR2_ARCH_HAS_MMU_OPTIONAL
 config BR2_cortex_a72
 	bool "cortex-A72"
-	select BR2_ARM_CPU_HAS_ARM
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
 	select BR2_ARM_CPU_HAS_NEON
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8