[target]: Add support for "fastboot reboot" and "fastboot reboot-bootloader" for all targets.

Add recovery partition for msm7630_surf target. Add support for
'adb shell reboot recovery' and 'adb shell reboot bootloader' for
msm7630_surf target. Add 'RESET_CHIP' proc_comm support for all targets.
diff --git a/target/init.c b/target/init.c
index 67671d4..e6f114c 100644
--- a/target/init.c
+++ b/target/init.c
@@ -51,3 +51,7 @@
 {
     return 0;
 }
+
+__WEAK void reboot_device(unsigned reboot_reason)
+{
+}