staging: r8188eu: remove header file HalHWImg8188E_FW.h

The header file HalHWImg8188E_FW.h is not used in the driver.
Remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210911231844.16268-1-straube.linux@gmail.com


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