To be used in board configuration. Expands to the path of the board's
build directory. Also simplifies main Makefile a bit.
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
This commit adds explanatory notes and updates existing t530 and w530 boards to generally align them with the dGPU points and provide signposting for those with and those without dGPU boards. It also adds an additional README in the blobs directory to explain the vbios extraction and building process.