Added latona initial board code (based on zoom3 board)

Signed-off-by: David Rodero <david@codiguiel.net>
Added latona MACH type, board-latona.h and updated init board code.

Signed-off-by: David Rodero <david@codiguiel.net>
Added board-latona-camera.c, board-latona-display.c, board-latona-flash.c, board-latona-peripherals.c and deleted references to board-zoom-debugboard.c as it is not necessary for latona.

Signed-off-by: David Rodero <david@codiguiel.net>