Input: cros_ec_keyb - optimize ghosting algorithm

Previous algorithm was a bit conservative and complicating with respect to
identifying key ghosting.  This CL uses the bitops hamming weight function
(hweight8) to count the number of matching rows for colM & colN.  If that
number is > 1 ghosting is present.

Additionally it removes NULL keys and our one virtual keypress KEY_BATTERY
from consideration as these inputs are never physical keypresses.

Signed-off-by: Todd Broch <[email protected]>
Reviewed-by: Vincent Palatin <[email protected]>
Reviewed-by: Luigi Semenzato <[email protected]>
Tested-by: Andreas Färber <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>

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