LinuxKPI: Add linux/capability.h header

Required by drm-kmod.

Obtained from:	DragonflyBSD
MFC after:	1 week
Reviewed by:	hselasky, manu

Differential Revision:	https://reviews.freebsd.org/D33559

sys/compat/linuxkpi/common/include/linux/capability.h

@@ -0,0 +1,51 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2015 Rimvydas Jasinskas
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * linux/capability.h
+ *
+ * Simple capable() priv_check helper
+ */
+
+#ifndef _LINUX_CAPABILITY_H
+#define	_LINUX_CAPABILITY_H
+
+#include <sys/types.h>
+#include <sys/proc.h>
+#include <sys/priv.h>
+
+#define	CAP_SYS_ADMIN		PRIV_DRIVER
+#define	CAP_SYS_NICE		PRIV_SCHED_SETPRIORITY
+
+static inline bool
+capable(const int tryme)
+{
+	return (priv_check(curthread, tryme) == 0);
+}
+
+#endif /* _LINUX_CAPABILITY_H */