Introduce TC1 platform

This moves the uboot header and android image scripts to a
common folder, as well as introduces the script for tc1.
The main difference between tc0 and tc1 script is the location
where kernel Image is picked up from for AVB.

Signed-off-by: Usama Arif <usama.arif@arm.com>
Change-Id: I95da8e3c20123fbd2071dc83e9b3223461cf1dcb