Add support for update-on-boot feature.

Add a separate system service RecoverySystemService to handle recovery
related requests (calling uncrypt to de-encrypt the OTA package on the
/data partition, setting up bootloader control block (aka BCB) and etc).

We used to trigger uncrypt in ShutdownThread before rebooting into
recovery. Now we expose new SystemApi (RecoverySystem.processPackage())
to allow the caller (e.g. GmsCore) to call that upfront before
initiating a reboot. This will reduce the reboot time and get rid of the
progress bar ("processing update package"). However, we need to reserve
the functionality in ShutdownThread to optionally call uncrypt if
finding that's still needed.

In order to support the update-on-boot feature, we also add new
SystemApis scheduleUpdateOnBoot() and cancelScheduledUpdate() into
android.os.RecoverySystem. They allow the caller (e.g. GmsCore) to
schedule / cancel an update by setting up the BCB, which will be read by
the bootloader and the recovery image. With the new SystemApis, an
update package can be processed (uncrypt'd) in the background and
scheduled to be installed at the next boot.

Bug: 26830925
Change-Id: Ic606fcf5b31c54ce54f0ab12c1768fef0fa64560

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