tty: serial: imx: remove the use of MXC_INTERNAL_IRQS

As the part of the effort to enable SPARE_IRQ for imx platform,
the macro MXC_INTERNAL_IRQS will be removed. The imx serial driver
has a references to it for a decision on flags of request_irq call
based on rtsirq is beyond MXC_INTERNAL_IRQS. However the searching
on imx platform code tells that rtsirq will never be beyond
MXC_INTERNAL_IRQS. That said, the check, consequently the reference
to MXC_INTERNAL_IRQS are not needed, so remove them.

Signed-off-by: Shawn Guo <[e-mail]>
Cc: [e-mail]
Acked-by: Greg Kroah-Hartman <[e-mail]>
Acked-by: Sascha Hauer <[e-mail]>
Acked-by: Dong Aisheng <[e-mail]>

drivers/tty/serial/imx.c

···
 #define SERIAL_IMX_MAJOR        207
 #define MINOR_START	        16
 #define DEV_NAME		"ttymxc"
-#define MAX_INTERNAL_IRQ	MXC_INTERNAL_IRQS
 
 /*
  * This determines how often we check the modem status signals
···
 
 		/* do not use RTS IRQ on IrDA */
 		if (!USE_IRDA(sport)) {
-			retval = request_irq(sport->rtsirq, imx_rtsint,
-				     (sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
-				       IRQF_TRIGGER_FALLING |
-				       IRQF_TRIGGER_RISING,
+			retval = request_irq(sport->rtsirq, imx_rtsint, 0,
 					DRIVER_NAME, sport);
 			if (retval)
 				goto error_out3;