efi: add and use new efi_device_has_guid helper ...

We have at least two places where we check if a efidev has a particular
guid and a follow-up commit will introduce a third place.

So lets factor it out into a helper.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: populate boot source instance ...

We already determine the boot source variable at core init level, but so
far we didn't populate the instance because the numbering of the block
devices isn't known that early. Introduce a helper to check if a block
device is the boot source and if it is, have the block device driver
populate the missing boot source instance.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: make sure efi-fs is started in the right order ...

with this parch, EFI System partition will be mounted to /boot
instead of /mnt/diskXX.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: move x86 clocksource init at core initcall level ...

so we can use device/driver model

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: move debug_ll.h to include/efi ...

so other arch could include it too

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: move bus driver to driver/efi ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>