patches/openwrt: dvb: add kernel package for demodulator Sony CXD2841ER

This demodulator can be found, for example, in Astrometa DVB-T2 revision
2018. This enables it for kernel versions, but support for slave
demodulator was added in kernel 5.0.

patches/openwrt/to-upstream/0008-kernel-Initial-DVB-support.patch

-From 63b25e8a727ca6cfbe4d54aaf1c4d798f7daad29 Mon Sep 17 00:00:00 2001
+From 616cfe85713380a1ff2378ed59cdc570ef0e1474 Mon Sep 17 00:00:00 2001
 From: Michal Hrusecky <michal.hrusecky@nic.cz>
 Date: Tue, 19 Jun 2018 12:45:40 +0200
 Subject: [PATCH] kernel: Initial DVB support
@@ -12,16 +12,16 @@ is unsupported, but the list can grow over the time.
 Signed-off-by: Michal Hrusecky <michal.hrusecky@nic.cz>
 Signed-off-by: Karel Kočí <karel.koci@nic.cz>
 ---
- package/kernel/linux/modules/dvb.mk | 1198 +++++++++++++++++++++++++++
- 1 file changed, 1198 insertions(+)
+ package/kernel/linux/modules/dvb.mk | 1208 +++++++++++++++++++++++++++
+ 1 file changed, 1208 insertions(+)
  create mode 100644 package/kernel/linux/modules/dvb.mk
 
 diff --git a/package/kernel/linux/modules/dvb.mk b/package/kernel/linux/modules/dvb.mk
 new file mode 100644
-index 0000000000..447c81e695
+index 0000000000..3db464e10e
 --- /dev/null
 +++ b/package/kernel/linux/modules/dvb.mk
-@@ -0,0 +1,1198 @@
+@@ -0,0 +1,1208 @@
 +#
 +# Copyright (C) 2018 CZ.NIC, z. s. p. o. <https://www.nic.cz/>
 +#
@@ -114,7 +114,6 @@ index 0000000000..447c81e695
 +CONFIG_DVB_EC100=n \
 +CONFIG_DVB_STV0367=n \
 +CONFIG_DVB_CXD2820R=n \
-+CONFIG_DVB_CXD2841ER=n \
 +CONFIG_DVB_ZD1301_DEMOD=n \
 +CONFIG_DVB_VES1820=n \
 +CONFIG_DVB_TDA10021=n \
@@ -541,6 +540,17 @@ index 0000000000..447c81e695
 +
 +$(eval $(call KernelPackage,dvb-pll))
 +
++define KernelPackage/dvb-cxd2841er
++  TITLE:=Sony CXD2841ER
++  $(call DvbFrontend,cxd2841er,CONFIG_DVB_CXD2841ER)
++endef
++
++define KernelPackage/dvb-cxd2841er/description
++ Sony CXD2841ER
++endef
++
++$(eval $(call KernelPackage,dvb-cxd2841er))
++
 +define KernelPackage/dvb-rtl2830
 +  TITLE:=Realtek RTL2830 DVB-T
 +  $(call DvbFrontend,rtl2830,CONFIG_DVB_RTL2830)