Implement CFG_CENTER primitives: STARTUPE2, BSCANE2, ICAPE2, DCIRESET, DNA_PORT, EFUSE_USR, FRAME_ECCE2, USR_ACCESSE2
0.6.0 add cfg_center_mid segbits for STARTUPE2 and cfg_center_* ppips
0.6.0 add cfg_center_mid segbits for STARTUPE2 and cfg_center_* ppips