Erasing a specific single sector for a parallel flash does not work correctly

With the driver function Drv_PflEraseFlashSector and Drv_PflEraseFlash the function "CFI_Erase" will be called.

Here the routine do always erase two sectors with the total length of 0x40000.

Reason:
/* one sector processed */
ulOffs += ptFls->ptPflSecTbl[ulSector].ulSize;