ath10k: define structure for the copy engine CTRL_1 regs

Define a structure for the copy engine CTRL_1 register
source, destination and dmax ring. This adds support to
avoid the conditional compilation, code optimization and
dynamic configuration of the copy engine register map
for respective hardware bus interface.

Change-Id: Ic0a4190b0735fb5d905ea75ac71e8060260dde74
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>