staging: rtl8723bs: remove duplicate names for _rtw_write32()

staging: rtl8723bs: remove duplicate names for _rtw_write32()

_rtw_write32() is redefined as rtw_write32() and
PlatformEFIOWrite4Byte(). Because rtw_write32() is the only name used in
the driver, remove the duplicate definitions and rename the function
from _rtw_write32() to rtw_write32()

Signed-off-by: Bryan Brattlof <hello@bryanbrattlof.com>
Link: https://lore.kernel.org/r/43917aee34e85139e613578cf6f14938211c8835.1621361919.git-series.hello@bryanbrattlof.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>