RTEMS: Add kvaddr_t and ksize_t

These types were introduced by FreeBSD commit:

"Make struct xinpcb and friends word-size independent.

Replace size_t members with ksize_t (uint64_t) and pointer members
(never used as pointers in userspace, but instead as unique
idenitifiers) with kvaddr_t (uint64_t). This makes the structs
identical between 32-bit and 64-bit ABIs.

On 64-bit bit systems, the ABI is maintained. On 32-bit systems,
this is an ABI breaking change. The ABI of most of these structs
was previously broken in r315662.  This also imposes a small API
change on userspace consumers who must handle kernel pointers
becoming virtual addresses.

PR:		228301 (exp-run by antoine)
Reviewed by:	jtl, kib, rwatson (various versions)
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D15386"

In RTEMS, there is no user/kernel space separation.  So, use the types
size_t and uintptr_t.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

newlib/libc/sys/rtems/include/machine/types.h

@@ -71,6 +71,9 @@ typedef	__uintptr_t	segsz_t;	/* segment size (in pages) */
 
 typedef	__uintptr_t	uintfptr_t;
 
+typedef	__uintptr_t	kvaddr_t;
+typedef	size_t		ksize_t;
+
 typedef	__intptr_t	vm_ooffset_t;
 typedef	__uintptr_t	vm_offset_t;
 typedef	__uintptr_t	vm_paddr_t;