x86/IO-APIC: consolidate / complete #define-s
Drop redundant ones from apic.h. Add delivery mode mask. Use them in
place of open coded hex numbers.
Take the opportunity and modify a helper function's parameters to be
just unsigned int. Also drop the bogus double underscore from its name,
as it and all its callers get touched anyway.
No functional change.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>