treewide: Remove "ERROR: "/"WARN: " prefixes from log messages

Now that the console system itself will clearly differentiate loglevels,
it is no longer necessary to explicitly add "ERROR: " in front of every
BIOS_ERR message to help it stand out more (and allow automated tooling
to grep for it). Removing all these extra .rodata characters should save
us a nice little amount of binary size.

This patch was created by running

  find src/ -type f -exec perl -0777 -pi -e 's/printk\(\s*BIOS_ERR,\s*"ERROR: /printk\(BIOS_ERR, "/gi' '{}' ';'

and doing some cursory review/cleanup on the result. Then doing the same
thing for BIOS_WARN with

  's/printk\(\s*BIOS_WARNING,\s*"WARN(ING)?: /printk\(BIOS_WARNING, "/gi'

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I3d0573acb23d2df53db6813cb1a5fc31b5357db8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61309
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Lance Zhao
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
diff --git a/src/lib/fmap.c b/src/lib/fmap.c
index 6ff8431..2511255 100644
--- a/src/lib/fmap.c
+++ b/src/lib/fmap.c
@@ -80,7 +80,7 @@
 		if (!verify_fmap(fmap))
 			goto register_cache;
 
-		printk(BIOS_ERR, "ERROR: FMAP cache corrupted?!\n");
+		printk(BIOS_ERR, "FMAP cache corrupted?!\n");
 		if (CONFIG(TOCTOU_SAFETY))
 			die("TOCTOU safety relies on FMAP cache");
 	}
@@ -301,13 +301,13 @@
 	const size_t s = region_device_sz(&fmrd);
 	struct fmap *fmap = cbmem_add(CBMEM_ID_FMAP, s);
 	if (!fmap) {
-		printk(BIOS_ERR, "ERROR: Failed to allocate CBMEM\n");
+		printk(BIOS_ERR, "Failed to allocate CBMEM\n");
 		return;
 	}
 
 	const ssize_t ret = rdev_readat(&fmrd, fmap, 0, s);
 	if (ret != s) {
-		printk(BIOS_ERR, "ERROR: Failed to read FMAP into CBMEM\n");
+		printk(BIOS_ERR, "Failed to read FMAP into CBMEM\n");
 		cbmem_entry_remove(cbmem_entry_find(CBMEM_ID_FMAP));
 		return;
 	}