openssl: set ARM CPU capabilities at compile time
BCM63138, BCM6846 and BCM6878 are asymmetric and have VFP/NEON support on CPU 0 only. The NEON support on CPU 0 is intended for use with VoIP and cannot be used for anything else as it is unavailable on CPU 1 and in addition VFP/NEON registers are not saved/restored on context switch. It is therefore necessary to disable auto-detection of NEON support in openssl for these SoCs.