The Makefile is in a bit of a weird order at the moment.
It's almost sorted alphabetically, but not entirely.
Also, one element uses a space before the += instead of a tab.

Fix this up and sort the lines alphabetically so we have
a consistent order in the Makefile.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200915071221.72895-15-stephan@gerhold.netSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>