staging: rtl8723bs: remove duplicate names for _rtw_read32()

_rtw_read32() is redefined as rtw_read32() and PlatformEFIORead4Byte().
Because rtw_read32() is the only name used in the driver, remove the
duplicate definitions and rename the function from _rtw_read32() to
rtw_read32()

Signed-off-by: Bryan Brattlof <hello@bryanbrattlof.com>
Link: https://lore.kernel.org/r/15956707341f76de683245c392063b8121a805ea.1621361919.git-series.hello@bryanbrattlof.com


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