switch dvb-firmware upstream to libreELEC and update to 1.4.2

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/dvb-firmware.git b/dvb-firmware.git
index 3fef04a4a4bfeba88ae3b20aff9d3a1fabf1c159..0eaf5b3928561d06d254cf5489d1e622bc827e5d 160000 (submodule)
--- a/dvb-firmware.git
+++ b/dvb-firmware.git
@@ -1 +1 @@
-Subproject commit 3fef04a4a4bfeba88ae3b20aff9d3a1fabf1c159
+Subproject commit 0eaf5b3928561d06d254cf5489d1e622bc827e5d