arm64: head: Drop SWAPPER_TABLE_SHIFT

There is no users of SWAPPER_TABLE_SHIFT after commit 84b04d3e
("arm64: kernel: Create initial ID map from C code"). Just drop it.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20241014030341.995806-1-gshan@redhat.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>