trees: don't hardcode use of mkpayload_grub

instead, make it a helper function, defined in target.cfg

this means that we can also do the same with other projects
in the future, and it is expected that we will have to.

these helper functions are used in cases where we want
additional actions to be performed.

actually, the helper could be anything. for example, you
could write:

mkhelper="./build foo bar"

and it would do that (at the point of execution, PWD
is the root directory of the build system)

Signed-off-by: Leah Rowe <leah@libreboot.org>

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