Limit media-supported values

ipphelper parses media-col-ready, media-ready, and media-supported into
a fixed-size array.  Add a check to make sure crafted
Get-Printer-Attributes responses don't run past the end.

Bug: 503542266
Test: atest libwfds_ipphelper_test
Flag: EXEMPT CVE_FIX
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:852c02f88419183d0469e833f232e178cc6f53e0
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d3e4806a36b4405b977e987bea7f48984a7a4b44
Merged-In: I86726f3cadbde0e08ea6ecc39ca6ad98fa6e579c
Change-Id: I86726f3cadbde0e08ea6ecc39ca6ad98fa6e579c