Remove _CLS in ACPI GPU device

The name _CLS describes the GPU device as VGA-compatible controller,
as per PCI CODE AND ID ASSIGNMENT SPECIFICATION. Since our driver is
unsigned, Microsoft Basic Display Adapter driver will be installed
instead.

This commit fixes the problem of GPU driver not getting installed
automatically.

Signed-off-by: Xilin Wu <strongtz@yeah.net>

diff --git a/sdm845Pkg/AcpiTables b/sdm845Pkg/AcpiTables
index 03d66e967a544183bcd6fea39f864635d377e219..8f1e956bc4122642bb930ee88695fe524a1a8373 160000 (submodule)
--- a/sdm845Pkg/AcpiTables
+++ b/sdm845Pkg/AcpiTables
@@ -1 +1 @@
-Subproject commit 03d66e967a544183bcd6fea39f864635d377e219
+Subproject commit 8f1e956bc4122642bb930ee88695fe524a1a8373