media: mxl5xx/stv0910/stv6111/ddbridge: fix MODULE_LICENSE to 'GPL v2'

In commit 3db30defab4b ("use correct MODULE_LINCESE for GPL v2 only
according to notice in header") in the upstream repository for the
mentioned four drivers at https://github.com/DigitalDevices/dddvb.git
(plus a few more which aren't part of the mainline kernel tree), the
MODULE_LICENSE was fixed to "GPL v2" and are now in sync with the
GPL copyright boilerplate. Apply this change to the kernel tree
drivers as well.

Cc: Ralph Metzler <rjkm@metzlerbros.de>
Cc: Manfred Voelkel <mvoelkel@DigitalDevices.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/dvb-frontends/mxl5xx.c

@@ -1893,4 +1893,4 @@ EXPORT_SYMBOL_GPL(mxl5xx_attach);
 
 MODULE_DESCRIPTION("MaxLinear MxL5xx DVB-S/S2 tuner-demodulator driver");
 MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/media/dvb-frontends/stv0910.c

@@ -1839,4 +1839,4 @@ EXPORT_SYMBOL_GPL(stv0910_attach);
 
 MODULE_DESCRIPTION("ST STV0910 multistandard frontend driver");
 MODULE_AUTHOR("Ralph and Marcus Metzler, Manfred Voelkel");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/media/dvb-frontends/stv6111.c

@@ -687,4 +687,4 @@ EXPORT_SYMBOL_GPL(stv6111_attach);
 
 MODULE_DESCRIPTION("ST STV6111 satellite tuner driver");
 MODULE_AUTHOR("Ralph Metzler, Manfred Voelkel");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/media/pci/ddbridge/ddbridge-main.c

@@ -318,5 +318,5 @@ module_exit(module_exit_ddbridge);
 
 MODULE_DESCRIPTION("Digital Devices PCIe Bridge");
 MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_VERSION(DDBRIDGE_VERSION);