staging: rtl8188eu: simplify phy_lc_calibrate

phy_lc_calibrate's is2t parameter is always false.
Remove some code that would be called only for is2t == true.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210725155902.32433-17-martin@kaiser.cx


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