arm64/numa: Fix a typo in comment of arm64_numa_init

Fix a typo in comment of arm64_numa_init. 'encomapssing' should
be 'encompassing'.

Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com>
Link: https://lore.kernel.org/r/20200901091154.10112-1-yanfei.xu@windriver.com


Signed-off-by: Will Deacon <will@kernel.org>