arch/Config.in.arm: add BR2_ARM_CPU_ARMV8
In order to prepare the addition of ARM64 cores, add the blind
BR2_ARM_CPU_ARMV8 option.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>