[Patch] add qmicli support to create/modify/delete PDP profiles

[Wolfgang Tolkien]

This adds qmicli support to create/modify/delete PDP profiles.
 * This patch only supports setting APN/auth/etc. using the 'modify' command. Creating a new profile is therefore a 2-step process: create and then modify.
 * Syntax is inconsistent: create/delete use old syntax since there are only one or two parameters, whereas the modify command uses key/value syntax. This mirrors other existing commands, but I'm happy to change it if people are unhappy with it.
 * Modems seem to allow empty strings for APN/Name/Username/Password (which makes sense if one wants to delete the value entirely), however libqmi does not allow this. This patch does not address this. Suggested workaround is to delete the profile and recreate it.

Wolfgang
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