Measured boot: Share image version as integer values

Changes the boot-time measured boot API to store the image version in
the shared boot area as a struct of integer values, rather than a
string. This saves doing the conversion from integers to a string in
boot code, which reduces bootloader code size.

Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Change-Id: I0c1006dfa62d61e0a3e0ae140d5710b1c7505006
3 files changed