This demo shows how protected storage works in RTT. It tests by write
and read data over PSA APIs, then check the integrity. The test will
run repeatedly, each time with different data.

The TFM package does not support LPC55S69 board officially yet.

Change-Id: Ib1cd4fc8166b21e3f774f092c95d2811d51123fe
Signed-off-by: NKevin Peng <kevin.peng@arm.com>
Signed-off-by: NKarl Zhang <karl.zhang@arm.com>