hwdb: set the resolution for a couple of bcm5974 touchpads

hwdb: set the resolution for a couple of bcm5974 touchpads

Verified for the 5,1 Macbook, the others are guesses based on the list of
supported devices of the moshi trackpad protector.
http://www.moshi.com/trackpad-protector-trackguard-macbook-pro#silver

Resolution calculated based on the min/max settings set in the kernel driver,
divided by the physical size. This is probably slightly off, but still better
than no resolution at all.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>