cmd/bdinfo: correct output of numerical values

Display all digits on 64bit systems. Currently we print only the lower
32 bits. Examples of values that can exceed 32 bits are the size and start of
memory banks.

For fdt_blob use the same output method as for other values. This avoids
misalignment.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>