staging: rtl8723bs: remove duplicate names for _rtw_read8()

_rtw_read8() is redefined as rtw_read8() and PlatformEFIORead1Byte().
Because rtw_read8() is the only name used in the driver, remove the
duplicate definitions and rename the function from _rtw_read8() to
rtw_read8()

Signed-off-by: Bryan Brattlof <hello@bryanbrattlof.com>
Link: https://lore.kernel.org/r/9880c86c2aad7d95a714d8b03b28b83634f98c1e.1621361919.git-series.hello@bryanbrattlof.com


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