staging: rtl8188eu: make some arrays static const

Make some arrays in phy_iq_calibrate() static const and adjust
the functions that take these arrays as parameters accordingly.
Reduces object file size by 84 bytes (GCC 9.3.1 x86_64).

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200524101514.20557-2-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>