qcacmn: Use qca8074v2 hal source files for qca6018

qca6018 and qca8072v2 uses the same WCSS block and the source
files of qca8074v2 shall be used for qca6018 as well

This will also ensure all fixes for qca8074v2 gets auto
propagated to qca6018 as well.

Change-Id: I2ead316c7ed16b6ee315bda05ce82d268ba04bbb
4 files changed