tests: use drmtest_skip() in caching ioctl helpers

This way we can rip out all the skip handling from the test control flow,
and additionally (by using drmtest_retval()) even get correct exit codes.

The only tricky part is that when we only want ot skip parts of a test
(like for gem_pread and gem_pwrite) we need to split out those parts as
subtests. But no addition of control-flow is required, the set/longjmp
magic in the helpers all makes it happen.

Also we make extensive use of the behaviour of drmtest_skip to skip
all subsequent subtests if it is called outside of a subtest. This allows
us to re-flatten the control flow a lot.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/drmtest.h

@@ -54,8 +54,8 @@ bool gem_has_bsd(int fd);
 bool gem_has_blt(int fd);
 bool gem_has_vebox(int fd);
 int gem_get_num_rings(int fd);
-int gem_has_caching(int fd);
-int gem_set_caching(int fd, uint32_t handle, int caching);
+void gem_check_caching(int fd);
+void gem_set_caching(int fd, uint32_t handle, int caching);
 uint32_t gem_get_caching(int fd, uint32_t handle);
 uint32_t gem_flink(int fd, uint32_t handle);
 uint32_t gem_open(int fd, uint32_t name);