powerHAL: Hikey: Fix compilation warning

It's reporting the compilation warning as below:

device/linaro/hikey/power/power_hikey.c:447:32: warning: unused variable 'hikey' [-Wunused-variable]
    struct hikey_power_module *hikey = container_of(module,

This commit removes unused variable 'hikey' and add mark '__unused' for
parameter 'module'to dismiss the compilation warning.

Change-Id: I86ca979278dde7c959e9dc398def5078c8a59c5c
Signed-off-by: Leo Yan <leo.yan@linaro.org>
1 file changed