Device: Move find_top_device to local static
The function is only used within lwis_device.c, and since each device
has a reference to top device already, move find_top_device to be a
local static function.
Bug: 201115698
Test: Build
Signed-off-by:
Edmond Chung <edmondchung@google.com>
Change-Id: Ifc2f2586e25b23a9a68ec23612cba60088838a1e
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