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/southbridge/intel/lynxpoint/early_me.c b/src/southbridge/intel/lynxpoint/early_me.c
index 6c73c33..947c570 100644
--- a/src/southbridge/intel/lynxpoint/early_me.c
+++ b/src/southbridge/intel/lynxpoint/early_me.c
@@ -45,14 +45,14 @@
 		udelay(ME_DELAY);
 	}
 	if (!count) {
-		printk(BIOS_ERR, "ERROR: ME is not ready!\n");
+		printk(BIOS_ERR, "ME is not ready!\n");
 		return -1;
 	}
 
 	/* Check for valid firmware */
 	hfs.raw = pci_read_config32(PCH_ME_DEV, PCI_ME_HFS);
 	if (hfs.fpt_bad) {
-		printk(BIOS_WARNING, "WARNING: ME has bad firmware\n");
+		printk(BIOS_WARNING, "ME has bad firmware\n");
 		return -1;
 	}
 
@@ -123,7 +123,7 @@
 		udelay(ME_DELAY);
 	}
 	if (!count) {
-		printk(BIOS_ERR, "ERROR: ME failed to respond\n");
+		printk(BIOS_ERR, "ME failed to respond\n");
 		return -1;
 	}