wakelock: Fix compilation when PM is disabled

If PM is disabled, WAKELOCK will also get disabled.
That gives compilation error at kgsl driver.

drivers/gpu/msm/kgsl_pwrctrl.c:755: error:
'struct wake_lock' has no member named 'name'

So, ifdef check whithin struct wake_lock will not give
more advantages but break builds. So, remove
CONFIG_HAS_WAKELOCK check in struct wake_lock.

Change-Id: I9f808f3b6ff14af6fa7f91dee7fe279ddab09add
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>