usb: phy: qusb2: Update tune params based on efuse value

For 8nm zero value is treated as a valid efuse value and
driver should honor this efuse value to update the tune
params. This change makes the updation of tune value possible
even if the efuse value is zero.

Change-Id: I6eac2e2414bf61b89aa41bebbfe56ad10017969e
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>