* config/a29k/tm-a29k.h: Renamed from config/a29k/tm-29k.h.

	* config/a29k/tm-a29k.h:  Renamed from config/a29k/tm-29k.h.
	* a29k-pinsn.c:  Renamed from am29k-pinsn.c.
	* a29k-tdep.c:  Renamed from am29k-tdep.c.
	* remote-eb.c, config/a29k/tm-ultra3.h:  Include renamed tm-a29k.h.
	* remote-monitor.c, remote-st2000.c, config/a29k/{nm-ultra3.h,
	tm-a29k.h, xm-ultra3.h}, config/romp/rtbsd.mh, doc/gdbinv-s.texi,
	testsuite/gdb.t15/funcargs.exp, testsuite/gdb.t17/callfuncs.exp:
	Map '29k' to 'a29k'.
	* config/a29k/{a29k-kern.mt, a29k-udi.mt, a29k.mt, ultra3.mt}
	(TDEPFILES):  Use renamed a29k-pinsn.o and a29k-tdep.o.
	* config/a29k/{a29k-udi.mt, a29k.mt} (TM_FILE):  Use renamed
	tm-a29k.h.
	* config/a29k/a29k-udi.mt (MT_CFLAGS):  Remove TARGET_AM29K
	define that does not appear anywhere else in the gdb source tree.
	* doc/gdbinit.texinfo:  Document renaming of tm-29k.h to tm-a29k.h.