[media] cx24120: i2c-max-write-size is now configurable

Some i2c-hosts are quite limited regarding maximum
i2c-burst-write-sizes. This patch makes the previously
hardcoded field configurable by users of the driver.

Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/dvb-frontends/cx24120.h b/drivers/media/dvb-frontends/cx24120.h
index 076d2dd..e5748aa 100644
--- a/drivers/media/dvb-frontends/cx24120.h
+++ b/drivers/media/dvb-frontends/cx24120.h
@@ -37,6 +37,9 @@
 
 	int (*request_firmware)(struct dvb_frontend *fe,
 				const struct firmware **fw, char *name);
+
+	/* max bytes I2C provider can write at once */
+	u16 i2c_wr_max;
 };
 
 #if IS_REACHABLE(CONFIG_DVB_CX24120)