treewide: Remove trailing whitespace

Remove trailing whitespace in files that aren't typically checked.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I8dfffbdeaadfa694fef0404719643803df601065
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50704
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Documentation/security/vboot/index.md

@@ -188,12 +188,12 @@ In addition to adding the coreboot files into the read-only region,
 enabling vboot causes the build script to add the read/write files into
 coreboot file systems in *FW_MAIN_A* and *FW_MAIN_B*.
 
-**RO_REGION_ONLY**  
+**RO_REGION_ONLY**
 
 The files added to this list will only be placed in the read-only region and
 not into the read/write coreboot file systems in *FW_MAIN_A* and *FW_MAIN_B*.
 
-**VBOOT_ENABLE_CBFS_FALLBACK**  
+**VBOOT_ENABLE_CBFS_FALLBACK**
 
 Normally coreboot will use the active read/write coreboot file system for all
 of it's file access when vboot is active and is not in recovery mode.