ARM: tegra: baseband: fix crash when queueing EDP work

ARM: tegra: baseband: fix crash when queueing EDP work

Add a check for EDP initialization in the driver before queueing EDP
work on the modem workqueue. Otherwise a BUG() will occur in cases
where the EDP client is not enabled.

Bug 1224860

Change-Id: Ibacb19abfe955244da4a833f39bd0adf13e4f04c
Signed-off-by: Neil Patel <neilp@nvidia.com>
Reviewed-on: http://git-master/r/194268
(cherry picked from commit d66e95baf6b0eaf94c635992b1ba93d4184cc08b)
Reviewed-on: http://git-master/r/195164
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Steve Lin <stlin@nvidia.com>