Revert "arm64: KVM: Use SMCCC_ARCH_WORKAROUND_1 for Falkor BP hardening"

Creates far too many conflicts with arm64/for-next/core, to be
resent post -rc1.

This reverts commit f9f5dc1950.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

arch/arm64/include/asm/kvm_asm.h

@@ -71,6 +71,8 @@ extern u32 __kvm_get_mdcr_el2(void);
 
 extern u32 __init_stage2_translation(void);
 
+extern void __qcom_hyp_sanitize_btac_predictors(void);
+
 #else /* __ASSEMBLY__ */
 
 .macro get_host_ctxt reg, tmp