Change in flashrom[master]: Makefile: use HAS_ USE_ pattern for serial support

[Thomas Heijligen (Code Review)]

Attention is currently required from: Felix Singer, Nico Huber.
Hello Felix Singer, build bot (Jenkins), Nico Huber, Angel Pons,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/62196

to look at the new patch set (#4).

Change subject: Makefile: use HAS_ USE_ pattern for serial support
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Makefile: use HAS_ USE_ pattern for serial support

Align the usage of serial function with the selection of other
dependencies.

Change-Id: Ica951e76d6362b01f09d23a729a2a6049e7f0b66
Signed-off-by: Thomas Heijligen 
---
M Makefile
1 file changed, 12 insertions(+), 10 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/96/62196/4