PRU Firmware: Add install-tobb target

This copies the generated binaries to BB via SCP.
Host may be changed using BBHOST

Signed-off-by: Kumar Abhishek <abhishek@theembeddedkitchen.net>
Kernel Driver Makefile: Add more install targets

Signed-off-by: Kumar Abhishek <abhishek@theembeddedkitchen.net>
Kernel Driver: Backport & Remove pru_rproc_bl.c

Removed as modifications backported to pru_rproc.c
The module is still located in the pru_rproc_bl branch
for further modifications.

Signed-off-by: Kumar Abhishek <abhishek@theembeddedkitchen.net>