staging: rtl8192e: remove r819xE_phyreg.h

This file is not used and its contents are duplicated in r8192E_phyreg.h.
Signed-off-by: NMateusz Kulikowski <mateusz.kulikowski@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>