arm64: fix typo in a comment

The double 'the' after 'If' in this comment "If the the TLB range ops
are supported..." is repeated. Consequently, one 'the' should be
removed from the comment.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210803142020.124230-1-wangborong@cdjrlc.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>