Staging: rtl8192e: Remove built-in firmware images

The driver can already use request_firmware() to load firmware, and
always does so.  There is code in init_firmware() to use the static
firmware images, but it's unreachable!  Remove the data and simplify
init_firmware() accordingly.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>