KVM: arm64: removed unused kern_hyp_va asm macro

The last usage of this macro was removed in:
    commit 5dc33bd ("KVM: arm64: nVHE: Pass pointers consistently to hyp-init")

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240208105422.3444159-3-joey.gouly@arm.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: jgouly

arch/arm64/include/asm/kvm_mmu.h

@@ -53,22 +53,6 @@
 
 #include <asm/alternative.h>
 
-/*
- * Convert a kernel VA into a HYP VA.
- * reg: VA to be converted.
- */
-.macro kern_hyp_va	reg
-#ifndef __KVM_VHE_HYPERVISOR__
-alternative_cb ARM64_ALWAYS_SYSTEM, kvm_update_va_mask
-	and     \reg, \reg, #1		/* mask with va_mask */
-	ror	\reg, \reg, #1		/* rotate to the first tag bit */
-	add	\reg, \reg, #0		/* insert the low 12 bits of the tag */
-	add	\reg, \reg, #0, lsl 12	/* insert the top 12 bits of the tag */
-	ror	\reg, \reg, #63		/* rotate back */
-alternative_cb_end
-#endif
-.endm
-
 /*
  * Convert a hypervisor VA to a PA
  * reg: hypervisor address to be converted in place