arm64: Remove unused variable in head.S

Remove an unused local variable from head.S.  It seems this was never
used even from the initial commit
9703d9d7 (arm64: Kernel booting and
initialisation), and is a left over from a previous implementation
of __calc_phys_offset.
Signed-off-by: NGeoff Levand <geoff@infradead.org>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm64/kernel/head.S

@@ -373,10 +373,6 @@ ENTRY(__boot_cpu_mode)
 	.long	0
 	.popsection
 
-	.align	3
-2:	.quad	.
-	.quad	PAGE_OFFSET
-
 #ifdef CONFIG_SMP
 	.align	3
 1:	.quad	.