arm64: mm: place __cpu_setup in .text

We drop __cpu_setup in .text.init, which ends up being part of .text.
The .text.init section was a legacy section name which has been unused
elsewhere for a long time.

The ".text.init" name is misleading if read as a synonym for
".init.text". Any CPU may execute __cpu_setup before turning the MMU on,
so it should simply live in .text.

Remove the pointless section assignment. This will leave __cpu_setup in
the .text section.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit f00083cae3)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

arch/arm64/mm/proc.S

@@ -152,8 +152,6 @@ alternative_else
 alternative_endif
 ENDPROC(cpu_do_switch_mm)
 
-	.section ".text.init", #alloc, #execinstr
-
 /*
  *	__cpu_setup
  *