[ALPS08794392] mmdvfs: add cat cmd for mmdvfs force step

[Description]
Add cat cmd for mmdvfs force step

[Test]
Sanity

MTK-Commit-Id: a7ae168db3219df7e0e4b3803c3faa5bb52cf35f

Signed-off-by: Anthony Huang <anthony.huang@mediatek.com>
CR-Id: ALPS08794392
Feature: mmdvfs
Change-Id: I81d69b51fe4773064e7119ab1698e04951004c73