Merge from Widevine repo of http://go/wvgerrit/169066
Now that we only have to support the v18 API, we can drop the v17
versions of these functions. For SelectKey, the new function fully
replaces it, so it has been removed. For the other functions, the v18
functions were calling the v17 functions previously. Now, they have been
rolled together.
These functions were not actually deprecated in the OEMCryptoCENC.h
header to allow OPK's serialization generator to still support them for
backwards-compatibility. Now that they are gone, this patch also
deprecates the functions.
Bug: 240995221
Merged from https://widevine-internal-review.googlesource.com/167338
Change-Id: I10261142121d4de8c96e2cd5fac570f7b536a82e
d3183f504e