staging: rtl8188eu: Remove function rtl8188e_silentreset_for_specific_platform()

Remove rtl8188e_silentreset_for_specific_platform() and function pointer
->silentreset pointing to it.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>