treewide: Unify Google branding

Branding changes to unify and update Chrome OS to ChromeOS (removing the
space).

This CL also includes changing Chromium OS to ChromiumOS as well.

BUG=None
TEST=N/A

Change-Id: I39af9f1069b62747dbfeebdd62d85fabfa655dcd
Signed-off-by: Jon Murphy <jpmurphy@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65479
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

src/acpi/dsdt_top.asl

@@ -3,7 +3,7 @@
 #include <acpi/acpigen_extern.asl>
 
 #if CONFIG(CHROMEOS_NVS)
-/* Chrome OS specific */
+/* ChromeOS specific */
 #include <vendorcode/google/chromeos/acpi/chromeos.asl>
 #endif