Patched libril-rk29-dataonly.so for Huawei UMG366

[jhansche]

This was done by disassembling the library, discovering the way it matches
USB vid/pid to a device type, and finding that it also matches the CGMM
device identifier string.

Once I discovered that, it was as simple as picking one of the existing
12d1:14ac device entries, and swapping the device identifier for "UMG366"

[jhansche]

This is done as a new file, so that it won't automatically take effect (you have to replace the existing file with this one in order to use it for that device).

Ultimately it'd be nice to be able to reverse engineer this into libril-rk29.c(pp) code, so that we can make our own adjustments to support new devices.

@jamesgol et al, don't feel like this has to be merged -- I'm putting it here mostly for reference.