libpayload/Makefile.inc: Initialize vboot submodule

After commit 63e54275f684 (libpayload: Implement new CBFS access API),
libpayload includes headers from commonlib/bsd, which in turn include
vb2_sha.h from vboot after commit 0655f78041ef (commonlib/bsd: Add new
CBFS core implementation). Usually submodules are initialized by the top
level Makefile.inc, but since this file is never read when building
libpayload based payloads outside the main coreboot build, the header
cannot be found unless the vboot submodule had previously been
initialized. This is especially evident when following Tutorial 1 in the
documentation, where the coreboot repo is cloned without recursing into
submodules and coreinfo is built separately from the coreboot build
using `make -C payloads/coreinfo`.

TEST=Deinitialize submodules and run `make -C payloads/coreinfo`.
Coreinfo should build without error.

Change-Id: I29b16525999921fbce51c2459d3d534b64e00b3c
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65222
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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