qcacmn: Retain the correct file copyright years

As part of Change-Id: I0dc410ae2e7c9df58ef53e3f20ca7979d086659e
for file dp_tx.c copyright years changed wrongly. So retain the
original copyright years.

Change-Id: Ib3e918744183bc59250590bc33dc7de75b1c38fb
CRs-Fixed: 2451733
1 file changed