msm: restart: Add support for emergency download mode.
msm: restart: Add support for emergency download mode.

We now support a mechanism to put the device into emergency
download mode. Running 'reboot edl' will reset the device into
edl mode.

Change-Id: I8b966aeab1f7ceee9ea7e5e652a0145f38c14ea9
Signed-off-by: Ameya Thakur <40e3b17d949bf20d292233b5cb15794bd41940ec@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas