ChromeOS: Use CHROMEOS_NVS guard

Replace CONFIG(CHROMEOS) with CONFIG(CHROMEOS_NVS) for cases where
the conditional and dependency are clearly about the presence of
an ACPI NVS table specified by vendorcode. For couple locations also
CONFIG(HAVE_ACPI_TABLES) changes to CONFIG(CHROMEOS_NVS).

This also helps find some of the CONFIG(CHROMEOS) cases that might
be more FMAP and VPD related and not about ChromeOS per-se, as
suggested by followup works.

Change-Id: Ife888ae43093949bb2d3e397565033037396f434
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50611
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Lance Zhao
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/lynxpoint/me.c

@@ -730,7 +730,7 @@ static int intel_me_extend_valid(struct device *dev)
 	printk(BIOS_DEBUG, "\n");
 
 	/* Save hash in NVS for the OS to verify */
-	if (CONFIG(CHROMEOS))
+	if (CONFIG(CHROMEOS_NVS))
 		chromeos_set_me_hash(extend, count);
 
 	return 0;