xtensa: wire up new syscalls

* linux/xtensa/syscallent.h (bpf, execveat): New entries.
diff --git a/linux/xtensa/syscallent.h b/linux/xtensa/syscallent.h
index 76c0439..6c84c67 100644
--- a/linux/xtensa/syscallent.h
+++ b/linux/xtensa/syscallent.h
@@ -328,3 +328,5 @@
 [337] = { 3,	0,		sys_seccomp,			"seccomp",		},
 [338] = { 3,	0,		sys_getrandom,			"getrandom",		},
 [339] = { 2,	TD,		sys_memfd_create,		"memfd_create",		},
+[340] = { 3,	TD,		sys_bpf,			"bpf",			},
+[341] = { 5,	TD|TF|TP|SE|SI,	sys_execveat,			"execveat",		},