Currently few macros related to CE descriptor are defined in qdf_types.h
Which is not the right place to have such macros. Hence moving them to
ce_internal.h file.
Also, have different macros for WCN6450 as the ce descriptor offsets got
changed for WCN6450.
Change-Id: I20414273793034bbab80304bcd643371d281fb7f
CRs-Fixed: 3386470