omni: Update LLVM version

Change-Id: I78ff877e9e6821b85e154fdf062cc33ddecf2a5b
diff --git a/config/BoardConfigKernel.mk b/config/BoardConfigKernel.mk
index 6d57772..a85737e 100644
--- a/config/BoardConfigKernel.mk
+++ b/config/BoardConfigKernel.mk
@@ -51,8 +51,8 @@
 KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
 endif
 
-LLVM_RELEASE_VERSION ?= 17
-LLVM_PREBUILTS_VERSION ?= clang-r498229b
+LLVM_RELEASE_VERSION ?= 18
+LLVM_PREBUILTS_VERSION ?= clang-r510928
 
 CLANG_PREBUILTS := $(BUILD_TOP)/prebuilts/clang/host/$(HOST_PREBUILT_TAG)/$(LLVM_PREBUILTS_VERSION)
 GCC_PREBUILTS := $(BUILD_TOP)/prebuilts/gcc/$(HOST_PREBUILT_TAG)