[media] em28xx: use the proper prefix for board names

All boards use EM28xxx_BOARD, to identify that the macro
refers to a card entry. So:

EM2874_LEADERSHIP_ISDBT -> EM2874_BOARD_LEADERSHIP_ISDBT

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/em28xx/em28xx-cards.c

···
 		} },
 	},
 
-	[EM2874_LEADERSHIP_ISDBT] = {
+	[EM2874_BOARD_LEADERSHIP_ISDBT] = {
 		.i2c_speed      = EM2874_I2C_SECONDARY_BUS_SELECT |
 				  EM28XX_I2C_CLK_WAIT_ENABLE |
 				  EM28XX_I2C_FREQ_100_KHZ,
···
 	{0x77800080, EM2860_BOARD_TVP5150_REFERENCE_DESIGN, TUNER_ABSENT},
 	{0xc51200e3, EM2820_BOARD_GADMEI_TVR200, TUNER_LG_PAL_NEW_TAPC},
 	{0x4ba50080, EM2861_BOARD_GADMEI_UTV330PLUS, TUNER_TNF_5335MF},
-	{0x6b800080, EM2874_LEADERSHIP_ISDBT, TUNER_ABSENT},
+	{0x6b800080, EM2874_BOARD_LEADERSHIP_ISDBT, TUNER_ABSENT},
 };
 
 /* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */

drivers/media/video/em28xx/em28xx-dvb.c

···
 	em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
 	/* init frontend */
 	switch (dev->model) {
-	case EM2874_LEADERSHIP_ISDBT:
+	case EM2874_BOARD_LEADERSHIP_ISDBT:
 		dvb->fe[0] = dvb_attach(s921_attach,
 				&sharp_isdbt, &dev->i2c_adap);
 

drivers/media/video/em28xx/em28xx.h

···
 #define EM2800_BOARD_VC211A			  74
 #define EM2882_BOARD_DIKOM_DK300		  75
 #define EM2870_BOARD_KWORLD_A340		  76
-#define EM2874_LEADERSHIP_ISDBT			  77
+#define EM2874_BOARD_LEADERSHIP_ISDBT			  77
 #define EM28174_BOARD_PCTV_290E                   78