toradex: configblock: extend for eMMC on T30 and fix some issues

toradex: configblock: extend for eMMC on T30 and fix some issues

Fix eMMC operation due to it always reading/writing a full block of 512
bytes.
Add all currently known product IDs.
Allow writing config block on eMMC as well.
Fix potential allocation alignment issues during storage accesses.
Implement interactive config block generation for Tegras.
Fix memory leak due to not freeing config block memory area after
generation.

While at it shorten all lines to 80 characters adhering to coding
style.