lib: cordic: add library module providing cordic angle calculation

The brcm80211 driver in the staging tree has a cordic function to
determine cosine and sine for a given angle. Feedback received from
John Linville suggested that these kind of functions should be made
available to others as a library function in the kernel tree. The
b43 driver also has a cordic angle calculation implemented.

Cc: [email protected]
Cc: [email protected]
Cc: "John W. Linville" <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Larry Finger <[email protected]>
Reviewed-by: Roland Vossen <[email protected]>
Reviewed-by: Henry Ptasinski <[email protected]>
Reviewed-by: Franky (Zhenhui) Lin <[email protected]>
Signed-off-by: Arend van Spriel <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

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