fakekey: Simplify speakup_fake_key_pressed through this_cpu_ops

The whole function can be expressed as a simple this_cpu_read() operation.
The function overhead is now likely multiple times that of the single
instruction that is executed in it.

Sedat: fixed compile failure caused by an extra ')'.

Cc: William Hubbs <w.d.hubbs@gmail.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>