MeasuredBoot: Fix and optimize test data

Fix:
 - The input size of the sw_type param was wrong. It was
   larger than the actual size of the data. It causes an
   overread (garbe was read) when `load_test_measurement_data()`
   populates the input and the expected data structures.
   This causes a verification failure because the received and
   expected measurement was different.

Optimization:
  - Add const modifier to the input and the expected data
    to save RAM.
  - Replace implicitly declared arrays with explicit ones.
    This avoids that the same data is added to the .data section
    multiple times.
  - RAM usage is reduced by ~1KB in total.

Change-Id: Ic2496353613f1a7333a3cb6e39d84b9884dc55f9
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
2 files changed