bpf: Remove inclusions of crypto/sha1.h

Since commit 603b441623 ("bpf: Update the bpf_prog_calc_tag to use
SHA256") made BPF program tags use SHA-256 instead of SHA-1, the header
<crypto/sha1.h> no longer needs to be included.  Remove the relevant
inclusions so that they no longer unnecessarily come up in searches for
which kernel code is still using the obsolete SHA-1 algorithm.

Since net/ipv6/addrconf.c was relying on the transitive inclusion of
<crypto/sha1.h> (for an unrelated purpose) via <linux/filter.h>, make it
include <crypto/sha1.h> explicitly in order to keep that file building.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Acked-by: Paul Chaignon <paul.chaignon@gmail.com>
Link: https://lore.kernel.org/r/20260314214555.112386-1-ebiggers@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

include/linux/filter.h

@@ -21,7 +21,6 @@
 #include <linux/if_vlan.h>
 #include <linux/vmalloc.h>
 #include <linux/sockptr.h>
-#include <crypto/sha1.h>
 #include <linux/u64_stats_sync.h>
 
 #include <net/sch_generic.h>

kernel/bpf/core.c

@@ -18,7 +18,6 @@
  */
 
 #include <uapi/linux/btf.h>
-#include <crypto/sha1.h>
 #include <linux/filter.h>
 #include <linux/skbuff.h>
 #include <linux/vmalloc.h>

net/ipv6/addrconf.c

@@ -36,6 +36,7 @@
 
 #define pr_fmt(fmt) "IPv6: " fmt
 
+#include <crypto/sha1.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/kernel.h>