ARCH: SPL: Add parametric board initializer

ARCH: SPL: Add parametric board initializer

Add a structure for table-driven configuration mechanism such that no recompilation
is needed to update the configuration parameters, rather than hard-coding
board initialization parameters.

Signed-off-by: Che-Liang Chiou <[email protected]>
Signed-off-by: Abhilash Kesavan <[email protected]>
Signed-off-by: Tom Wai-Hong Tam <[email protected]>
Signed-off-by: Simon Glass <[email protected]>
Signed-off-by: Rajeshwari Shinde <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>