ltp-testsuite: drop redundant arch dependency entries

BR2_TOOLCHAIN_HAS_SYNC_4 is enabled for all these architectures except
arc. There is no need to list them explicitly.

Cc: Romain Naour <romain.naour@gmail.com>
Cc: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ltp-testsuite/Config.in

@@ -5,11 +5,6 @@ config BR2_PACKAGE_LTP_TESTSUITE_ARCH_SUPPORTS
 	# provided in ltp-testsuite
 	default y if BR2_TOOLCHAIN_HAS_SYNC_4
 	default y if BR2_arc
-	default y if BR2_i386
-	default y if BR2_powerpc
-	default y if BR2_powepc64
-	default y if BR2_powerpc64le
-	default y if BR2_x86_64
 	# does not build on nios2, cachectl.h issue
 	depends on !BR2_nios2