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/soc/amd/common/block/pm/pmlib.c b/src/soc/amd/common/block/pm/pmlib.c
index f1b0b27..5ce6b7b 100644
--- a/src/soc/amd/common/block/pm/pmlib.c
+++ b/src/soc/amd/common/block/pm/pmlib.c
@@ -31,7 +31,7 @@
 		pwr_fail |= PWR_FAIL_PREV;
 		break;
 	default:
-		printk(BIOS_WARNING, "WARNING: Unknown power-failure state: %d\n",
+		printk(BIOS_WARNING, "Unknown power-failure state: %d\n",
 						CONFIG_MAINBOARD_POWER_FAILURE_STATE);
 		pwr_fail |= PWR_FAIL_OFF;
 		break;