ath10k: define structure for the copy engine register map

Instead of defining the copy engine register map as a macro,
Define a structure for the copy engine register map to avoid
the conditional compilation, code optimization and dynamic
configuration of the copy engine register map for respective
hardware bus interface.

Change-Id: I799794ed85b83e342c2aab3d12b2876fc28d680b
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>