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/drivers/intel/fsp1_1/fsp_relocate.c b/src/drivers/intel/fsp1_1/fsp_relocate.c
index 7aaba82..875fcf2 100644
--- a/src/drivers/intel/fsp1_1/fsp_relocate.c
+++ b/src/drivers/intel/fsp1_1/fsp_relocate.c
@@ -15,14 +15,14 @@
 	void *new_loc = cbfs_cbmem_alloc(prog_name(fsp_relocd),
 					 CBMEM_ID_REFCODE, &size);
 	if (new_loc == NULL) {
-		printk(BIOS_ERR, "ERROR: Unable to load FSP into memory.\n");
+		printk(BIOS_ERR, "Unable to load FSP into memory.\n");
 		return -1;
 	}
 
 	fih_offset = fsp1_1_relocate((uintptr_t)new_loc, new_loc, size);
 
 	if (fih_offset <= 0) {
-		printk(BIOS_ERR, "ERROR: FSP relocation failure.\n");
+		printk(BIOS_ERR, "FSP relocation failure.\n");
 		return -1;
 	}