[S] Change in coreboot[main]: util/cbfstool/cbfs-payload-linux: Do not compress bzImage

[Maximilian Brune (Code Review)]

Attention is currently required from: Julius Werner, Lean Sheng Tan.

Hello Julius Werner, Lean Sheng Tan, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/83615?usp=email

to look at the new patch set (#3).

Change subject: util/cbfstool/cbfs-payload-linux: Do not compress bzImage
......................................................................

util/cbfstool/cbfs-payload-linux: Do not compress bzImage

Compressing the already compressed bzImage does not yield any
fruit. If you are lucky it actually makes the image a little bit
smaller. If you are unlucky the image actually gets bigger and since the
compressing function is not checked for any erros, coreboot just builds
successfully even though the payload is broken through compression.

Before this patch you could possibly get this error during compilation:
```
E: LZMA: LzmaEnc_Encode failed 9.
```
and your linux payload would end up something like this in CBFS:
```
FMAP REGION: COREBOOT
Name                           Offset     Type           Size   Comp
....
fallback/payload               0x1c9c0    simple elf        511 none
....
```

That doesn't stop coreboot from finishing the build though, since we
currently don't check for errors from the compression. That is an issue
for another patch though.

Tested:
Build and run QEMU-Q35 with Linux bzImage as payload.

Change-Id: I022982667515ce721d98af534414d9e336b5f35a
Signed-off-by: Maximilian Brune 
---
M util/cbfstool/cbfs-payload-linux.c
1 file changed, 16 insertions(+), 20 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/15/83615/3