selftests: vDSO: vdso_test_abi: Drop clock availability tests

The test uses the kselftest.h framework and declares in its testplan to
always execute 16 testcases. If any of the clockids were not available,
the testplan would not be satisfied anymore and the test would fail.
Apparently that never happened, so the clockids are always available.

Remove the pointless checks.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250812-vdso-tests-fixes-v2-4-90f499dd35f8@linutronix.de

Author: t-8ch

tools/testing/selftests/vDSO/vdso_test_abi.c

@@ -197,37 +197,13 @@ int main(int argc, char **argv)
 
 	vdso_test_gettimeofday();
 
-#if _POSIX_TIMERS > 0
-
-#ifdef CLOCK_REALTIME
 	vdso_test_clock(CLOCK_REALTIME);
-#endif
-
-#ifdef CLOCK_BOOTTIME
 	vdso_test_clock(CLOCK_BOOTTIME);
-#endif
-
-#ifdef CLOCK_TAI
 	vdso_test_clock(CLOCK_TAI);
-#endif
-
-#ifdef CLOCK_REALTIME_COARSE
 	vdso_test_clock(CLOCK_REALTIME_COARSE);
-#endif
-
-#ifdef CLOCK_MONOTONIC
 	vdso_test_clock(CLOCK_MONOTONIC);
-#endif
-
-#ifdef CLOCK_MONOTONIC_RAW
 	vdso_test_clock(CLOCK_MONOTONIC_RAW);
-#endif
-
-#ifdef CLOCK_MONOTONIC_COARSE
 	vdso_test_clock(CLOCK_MONOTONIC_COARSE);
-#endif
-
-#endif
 
 	vdso_test_time();