staging: rtl8188eu: simplify rtl88eu_phy_iq_calibrate

The boolean is2t variable in rtl88eu_phy_iq_calibrate is always false.
Remove some code that's unused in this case.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210726195354.28548-1-martin@kaiser.cx


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