[linux-kernel] Update patches for v2

* Reduce stack usage of many zstd functions, none use over 388 B anymore.
* Remove an incorrect `const` in `xxhash`.

contrib/linux-kernel/lib/zstd/zstd_common.c

@@ -51,7 +51,7 @@ ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize)
 void *ZSTD_stackAllocAll(void *opaque, size_t *size)
 {
 	ZSTD_stack *stack = (ZSTD_stack *)opaque;
-	*size = stack->end - ZSTD_PTR_ALIGN(stack->ptr);
+	*size = (BYTE const *)stack->end - (BYTE *)ZSTD_PTR_ALIGN(stack->ptr);
 	return stack_push(stack, *size);
 }