initrd: use nm_utils_strsplit_set_with_empty() to split strings in nmi_dt_reader_parse()th/initrd-parse-cleanup

strsplit() can be done in O(n) runtime and one memory allocation.
g_strsplit() creates a deepcopied strv array, requiring allocate
memory for each token separately. Also, it's implemented by constructing
the list with a tempory GSList, so it actually needs two allocations
for each tokens.

I think we should not use such wasteful API, if we don't need a clone
of the tokens.

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