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>

src/arch/arm64/fit_payload.c

@@ -52,7 +52,7 @@ static bool decompress_kernel_header(const struct fit_image_node *node)
 		       scratch.raw, sizeof(scratch.raw));
 		break;
 	default:
-		printk(BIOS_ERR, "ERROR: Unsupported compression algorithm!\n");
+		printk(BIOS_ERR, "Unsupported compression algorithm!\n");
 		return false;
 	}
 
@@ -61,8 +61,7 @@ static bool decompress_kernel_header(const struct fit_image_node *node)
 		die("ERROR: Partial decompression ran over scratchbuf!\n");
 
 	if (scratch.header.magic != KERNEL_HEADER_MAGIC) {
-		printk(BIOS_ERR,
-		       "ERROR: Invalid kernel magic: %#.8x\n != %#.8x\n",
+		printk(BIOS_ERR, "Invalid kernel magic: %#.8x\n != %#.8x\n",
 		       scratch.header.magic, KERNEL_HEADER_MAGIC);
 		return false;
 	}