Platform: NXP: Increase the PS and ITS area sizes

- Use the default maximum number of ITS assets on the LPCXpresso55S69
  board and also adjust the size of the ITS area accordingly,
- Adjust the size of the PS area for the default maximum number and
  size of the assets.

Change-Id: Ic3d78903dea303b87a1c813a03e9b023b128643a
Signed-off-by: David Vincze <david.vincze@linaro.org>
2 files changed