Fix $srctree logic for the top-level Kconfig file

Due to a major design braino, the top-level Kconfig file passed to
Kconfig.__init__() wasn't looked up relative to $srctree, breaking
out-of-tree usage for e.g. menuconfig.

With this change, Kconfig files are consistently looked up relative to
$srctree, which makes a lot more sense.

Also remove note re. loading a subset of Kconfig files. Saying that the
top-level file and all source'd Kconfig files are looked up relative to
$srctree should make the behavior clear enough.

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