hp/pavilion_m6_1035dx: Rename "LID0" ACPI object to "LID"

There is only one lid switch, so it does not make sense to number it.
This naming is also consistent with the examples in the ACPI spec.

Change-Id: Ida0a4a89ca03b2aad4fc77e52996e86332d370cd
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5545
Tested-by: build bot (Jenkins)
Reviewed-by: Idwer Vollering <vidwer@gmail.com>