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

[Thomas Heijligen (Code Review)]

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

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

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

to look at the new patch set (#2).

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

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, 7 insertions(+), 12 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/96/62196/2