ChromeOS: Refactor ACPI CNVS generation

Remove chromeos_dsdt_generator() calls under mainboard, it
is possible to make the single call to fill \CNVS and
\OIPG without leveraging device operations.

Change-Id: Id79af96bb6c038d273ac9c4afc723437fc1f3fc9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55502
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/lib/hardwaremain.c

@@ -24,7 +24,7 @@
 #include <timer.h>
 #include <timestamp.h>
 #include <types.h>
-#include <vendorcode/google/chromeos/gnvs.h>
+#include <vendorcode/google/chromeos/chromeos.h>
 #include <version.h>
 
 static boot_state_t bs_pre_device(void *arg);