* binutils/gcc program prefix to $(HW)-*

Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>
+ hw: Raspberry Pi model B

Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>
* $(HW)-* commands
* TC=$(HW).TC

Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>