libsepol: add bpf_token_perms polcap

New policy capability 'bpf_token_perms' required by patch to support SELinux
for BPF token control:
  https://lore.kernel.org/selinux/20250806180149.1995-1-ericsu@linux.microsoft.com/

Signed-off-by: Eric Suen <ericsu@linux.microsoft.com>
Signed-off-by: Jason Zaman <jason@perfinion.com>

Author: Eric Suen

libsepol/include/sepol/policydb/polcaps.h

@@ -21,6 +21,7 @@ enum {
 	POLICYDB_CAP_GENFS_SECLABEL_WILDCARD,
 	POLICYDB_CAP_FUNCTIONFS_SECLABEL,
 	POLICYDB_CAP_MEMFD_CLASS,
+	POLICYDB_CAP_BPF_TOKEN_PERMS,
 	__POLICYDB_CAP_MAX
 };
 #define POLICYDB_CAP_MAX (__POLICYDB_CAP_MAX - 1)

libsepol/src/polcaps.c

@@ -20,6 +20,7 @@ static const char * const polcap_names[POLICYDB_CAP_MAX + 1] = {
 	[POLICYDB_CAP_GENFS_SECLABEL_WILDCARD]		= "genfs_seclabel_wildcard",
 	[POLICYDB_CAP_FUNCTIONFS_SECLABEL]		= "functionfs_seclabel",
 	[POLICYDB_CAP_MEMFD_CLASS]			= "memfd_class",
+	[POLICYDB_CAP_BPF_TOKEN_PERMS]                  = "bpf_token_perms",
 };
 
 int sepol_polcap_getnum(const char *name)