components/apps: Delete oldest item if the total is more than 100

A simple yet effective method to manage the data file: use the 'sed'
command to simply delete the oldest line of data, to maintain the
data file like a FIFO.

Doing like this is to avoid the data file becomes larger and larger.

Issue-Id: SCM-5560
Signed-off-by: Robbie Cao <robbie.cao@arm.com>
Change-Id: I8aabf7e1aed7d155ffee2075aaeddabb332cd21f