mb/google/ocelot: Remove NPK device

This commit removes the `device ref npk on end` from the
`overridetree.cb` files for ocelot, similar to -
commit 85c65b0c20 (mb/google/fatcat: Remove NPK device from fatcat and francka variants)

This effectively disables the NPK device for these configurations
(because `npk` is default set to disable).

Change-Id: Iee1509f44f6543c23f9633ccd8d35d4a7e37b89e
Signed-off-by: Avi Uday <aviuday@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87753
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Pranava Y N <pranavayn@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/ocelot/variants/ocelot/overridetree.cb

@@ -617,7 +617,6 @@ chip soc/intel/pantherlake
 		end
 
 		device ref smbus on end
-		device ref npk on end
 		device ref hda off end
 	end
 end