m68k: remove useless file m68k-qreg.h

Unused since:

    commit e1f3808e
    Author: pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>
    Date:   Sat May 24 22:29:16 2008 +0000

        Convert m68k target to TCG.
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NThomas Huth <huth@tuxfamily.org>

target-m68k/m68k-qreg.h

-enum {
-#define DEFO32(name, offset) QREG_##name,
-#define DEFR(name, reg, mode) QREG_##name,
-#define DEFF64(name, offset) QREG_##name,
-    QREG_NULL,
-#include "qregs.def"
-    TARGET_NUM_QREGS = 0x100
-#undef DEFO32
-#undef DEFR
-#undef DEFF64
-};