checkpatch.pl doesn't match the vendor string properly

[alexandru-porosanu-nxp]

Describe the bug
checkpatch.pl will complain that the vendor string is not documented, although this is not the case
Due to the slight difference between the vendor-prefixes.yaml from Linux and vendor-prefix

To Reproduce
Steps to reproduce the behavior:

1. ./scripts/checkpatch.pl -f ./dts/arm/nxp/nxp_kw41z.dtsi
2. Notice the WARNING:UNDOCUMENTED_DT_STRING: warnings for all the vendors that are in the specific checked file.
   But looking into the vendor-prefixes.txt file, you can see both ARM as well as NXP

Expected behavior
No warning reported

Impact
Annoyance

Screenshots or console output

dts/arm/nxp/nxp_kw41z.dtsi:40: WARNING:UNDOCUMENTED_DT_STRING: DT compatible string vendor "arm" appears un-documented -- check ./dts/bindings/vendor-prefixes.txt
#40: FILE: dts/arm/nxp/nxp_kw41z.dtsi:40:
+			compatible = "arm,cortex-m0+";

dts/arm/nxp/nxp_kw41z.dtsi:52: WARNING:UNDOCUMENTED_DT_STRING: DT compatible string "nxp,kw41z-mcg" appears un-documented -- check ./dts/bindings/
#52: FILE: dts/arm/nxp/nxp_kw41z.dtsi:52:
+			compatible = "nxp,kw41z-mcg";

dts/arm/nxp/nxp_kw41z.dtsi:52: WARNING:UNDOCUMENTED_DT_STRING: DT compatible string vendor "nxp" appears un-documented -- check ./dts/bindings/vendor-prefixes.txt
...

Environment (please complete the following information):

• OS: Ubuntu 18.04 LTS
• Toolchain: Zephyr SDK
• Commit SHA: 2d9baf9

Additional context
This issue seems to stem from the different format for vendor-prefixes.txt in Zephyr versus vendor-prefixes.yaml in Linux. The commit 5b10fac inadvertently replaces the check with the one from Linux.

[stephanosio]

There is already a PR that fixes this:
#24959

[alexandru-porosanu-nxp]

There is already a PR that fixes this:
#24959

Right, I missed that. I'll close this one (and the corresponding PR)