staging: r8188eu: remove constant phy_IQCalibrate_8188E parameter

The only caller of phy_IQCalibrate_8188E sets the is2t parameter
to false.

Remove the parameter and resulting dead code. This includes the
phy_PathB_IQK_8188E and _PHY_PathAStandBy functions.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211107143100.9047-4-martin@kaiser.cx


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