tools/liblockdep: Fix include of asm/hash.h

Commit 71ae8aac ("lib: introduce arch optimized hash library")
added an include to <linux/hash.h> for setting up an architecture
specific fast hash.

This patch mirrors the fix used for perf, titled "tools: perf: util: fix
include for non x86 architectures".
Signed-off-by: NIra W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: NSasha Levin <sasha.levin@oracle.com>

tools/lib/lockdep/uinclude/asm/hash.h

+#ifndef __ASM_GENERIC_HASH_H
+#define __ASM_GENERIC_HASH_H
+
+/* Stub */
+
+#endif /* __ASM_GENERIC_HASH_H */