Update SBAT to match GRUB2

Update sbat.csv to match the product identifier contained in
GRUB2's sbat.csv

BUG=b:195737944
TEST=make build & make dump-sbat

Change-Id: I07d10777abd79fabf21089ac96fa62f108bd3fa0

sbat.csv

diff --git a/sbat.csv b/sbat.csv
index 6f5ec34..7ad5a04 100644
--- a/sbat.csv
+++ b/sbat.csv
@@ -1,4 +1,4 @@
 sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
 shim,1,UEFI shim,shim,1,https://github.com/rhboot/shim
-shim.chromeos,1,Chrome OS,shim,15.4,https://chromium.googlesource.com/external/github.com/neverware/shim-build/
+shim.chromeos,1,ChromeOS,shim,15.4,https://chromium.googlesource.com/external/github.com/neverware/shim-build/