iface-modem: Increase unlock_required retries

SIMs from certain carriers take longer to be ready. An optimized
fix is in progress. Until then, we need a simple and stable fix
that works for M90.

BUG=b:184278156
TEST=emerge-trogdor modemmanager-next; Check that sims are detected by
MM

Change-Id: I8a3c7f670f826aac9896721488d6409cf562fbbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/modemmanager-next/+/2816302
Tested-by: Pavan Holla <pholla@google.com>
Reviewed-by: Harpreet Grewal <harpreet@chromium.org>
Reviewed-by: Madhav . <madhavadas@google.com>
Reviewed-by: Andrew Lassalle <andrewlassalle@chromium.org>
Commit-Queue: Pavan Holla <pholla@google.com>
(cherry picked from commit 66b7cadf17c051e20538aedb61d8daa864055fc1)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/modemmanager-next/+/2818198
1 file changed