Add TOSA rank requirements to TOSA XML

Adds new optional element to argument 'rank'
- Must supply minimum and maximum rank
   - Integer values or the level based "MAX_RANK"
   - trailing modifiers allowed for "MAX_RANK"
- Displays in a new column in the document
- Document generation validates rank against specified shape

Change-Id: I507dc51bfe012d3230af43103c6c423a6f1e92b5
Signed-off-by: Eric Kunze <eric.kunze@arm.com>