moved srst_pulls_trst check into arm7_9_common.c. Not tested yet, if it is...

moved srst_pulls_trst check into arm7_9_common.c. Not tested yet, if it is broken it should "only" print bogus warnings or not print a warning when it should have.

git-svn-id: svn://svn.berlios.de/openocd/trunk@670 b42882b7-edfa-0310-969c-e2dbd0fdcd60