Qualcomm suggests to use mux id values >= 0x81: though this does not seem a strict mandatory rule, there are scenarios in which the usage of a specifix mux id is required otherwise various kind of issues could happen (e.g. call failure, limited throughput...). A new ID_MM_INITIAL_QMAP_MUX_ID udev tag allows setting the first initial mux id value to be used when creating the multiplexed data connection. Signed-off-by: Daniele Palmas <dnlplm@gmail.com>