use target_reset_common.c to include target_reset.c

Use target_reset_common.c instead of adding a HAL-Target-XXX group for each target. It will be easier to add new targets in keil.

![cmsis-dap_target_reset](https://cloud.githubusercontent.com/assets/948283/3353825/b84659c6-fa8d-11e3-8e78-266aa003c0c7.png)