Freeze SPL to 2024-09-05

Change-Id: I3dfa3c342582d14c1b5b89061c8a58a72dc6cbcd
diff --git a/device.mk b/device.mk
index 1e0003d..20c9ffe 100644
--- a/device.mk
+++ b/device.mk
@@ -54,10 +54,10 @@
 POSTINSTALL_OPTIONAL_system=true
 
 # Set Vendor SPL to match platform
-VENDOR_SECURITY_PATCH = $(PLATFORM_SECURITY_PATCH)
+VENDOR_SECURITY_PATCH := 2024-09-05
 
 # Set boot SPL
-BOOT_SECURITY_PATCH = $(PLATFORM_SECURITY_PATCH)
+BOOT_SECURITY_PATCH := 2024-09-05
 
 PRODUCT_SOONG_NAMESPACES += \
 	hardware/google/av \