[media] nuvoton-cir: use IR_DEFAULT_TIMEOUT and consider SAMPLE_PERIOD

Switch to using the recently introduced IR default timeout value
(IR_DEFAULT_TIMEOUT) and consider the value of SAMPLE_PERIOD
when calculating the limit count register value.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/rc/nuvoton-cir.h

@@ -157,8 +157,8 @@ struct nvt_dev {
 /* total length of CIR and CIR WAKE */
 #define CIR_IOREG_LENGTH	0x0f
 
-/* RX limit length, 8 high bits for SLCH, 8 low bits for SLCL (0x7d0 = 2000) */
-#define CIR_RX_LIMIT_COUNT	0x7d0
+/* RX limit length, 8 high bits for SLCH, 8 low bits for SLCL */
+#define CIR_RX_LIMIT_COUNT  (IR_DEFAULT_TIMEOUT / US_TO_NS(SAMPLE_PERIOD))
 
 /* CIR Regs */
 #define CIR_IRCON	0x00