staging: rtl8188eu: remove unused IQKMatrixRegSetting array

The IQKMatrixRegSetting array in struct odm_rf_cal is initialised
but never used. Remove it.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210725155902.32433-18-martin@kaiser.cx


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