arm: tegra: baseband: add EDP support

arm: tegra: baseband: add EDP support

Adds support for two different types of EDP clients:
 - edp_modem_boot which will be used when executing the flashless boot sequence
 - edp_modem which will be used when the modem is running the app firmware and
   can be configured through sysfs

Bug 1045672

Change-Id: I1089b3fa3e3725a1cd60d7e475c4fb176e9d77c2
Signed-off-by: Neil Patel <neilp@nvidia.com>
Reviewed-on: http://git-master/r/191016
(cherry picked from commit 2bf573e13e4ceaa13235241e651dd47890f5a9fe)
Reviewed-on: http://git-master/r/160986
Reviewed-by: Harshada Kale <hkale@nvidia.com>
Tested-by: Harshada Kale <hkale@nvidia.com>