drivers/base: cacheinfo: fix annoying typo when DT nodes are absent

s/hierarcy/hierarchy/

Maybe the typo will annoy people enough so that they add the missing
nodes to their device-tree files, but I still think this is better off
fixed.

Change-Id: I06f02a4f32d144738a546065832dc615adf4eace
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 2539b258ec028351af954c169ea1b0ff72023a9f
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.9


Signed-off-by: Teng Fei Fan <tengfei@codeaurora.org>