tests: add xlat verbosity support to printxval

tests: add xlat verbosity support to printxval

* tests/Makefile.am (libtests_a_SOURCES): Remove printxval.c, add
printxval-Xabbrev.c, printxval-Xraw.c, and printxval-Xverbose.c.
(EXTRA_DIST): Add printxval.c.
* tests/printxval.c [!XLAT_RAW] (lookup_xlat): New function.
(printxval): Wrap in XLAT_NAME.
(sprintxlat, sprintxval): New functions.
* tests/printxval-Xabbrev.c: New file.
* tests/printxval-Xraw.c: Likewise.
* tests/printxval-Xverbose.c: Likewise.
* tests/tests.h (printxval): Remove declaration.
(printxval_abbrev, printxval_raw, printxval_verbose, sprintxlat_abbrev,
sprintxlat_raw, sprintxlat_verbose, sprintxval_abbrev, sprintxval_raw,
sprintxval_verbose): New declarations.
(printxval, sprintxlat, sprintxval): New macros, defined based on values
of XLAT_RAW amd XLAT_VERBOSE macros.
* tests/ioprio.c: Simplify the printing code since printxval now has
xlat verbosity support.