arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support

arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support

commit b092201e0020 upstream.

Add the detection and runtime code for ARM_SMCCC_ARCH_WORKAROUND_1.
It is lovely. Really.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
	no qcom hyp functions in
	arch/arm64/kernel/bpi.S
	arch/arm64/kernel/cpu_errata.c