arm: tegra: xmm: flash modem reset functionality

arm: tegra: xmm: flash modem reset functionality

Flash version modem need to do reset with gpio
and start enumeration on falling edge of ap wake.

Remove unused variable enum_delay_ms.

Bug 1003141

Change-Id: Ie43c693c3fead5c89b30c1b97cf1f3e4c05e5588
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/116886
Reviewed-by: Michael Hsu <mhsu@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Ken Chang <kenc@nvidia.com>
Tested-by: Ken Chang <kenc@nvidia.com>
Reviewed-by: Steve Lin <stlin@nvidia.com>
Rebase-Id: R41a06a3a1d2eb06af6bb67402ba3d9fe9b830152