[POWERPC] CPM_UART: Use inline function form of eieio

Signed-off-by: Kumar Gala <[e-mail]>

drivers/serial/cpm_uart/cpm_uart_core.c

···
 		}
 		bdp->cbd_datlen = count;
 		bdp->cbd_sc |= BD_SC_READY;
-		__asm__("eieio");
+		eieio();
 		/* Get next BD. */
 		if (bdp->cbd_sc & BD_SC_WRAP)
 			bdp = pinfo->tx_bd_base;