linker: noint memory region location

- There are linker file directives that must come at the
  start of the noinit region.  For example, the directive
  that allow that section to not exist in RAM before a
  certain address (. = MAX(ABSOLUTE(.), 0x34002000);).
- Before this update, those could only be added to the end
  of that region.  They will now have the option to be at the
  beginning or the end.

Signed-off-by: Bill Waters <bill.waters@infineon.com>