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/pi/agesawrapper.c b/src/soc/amd/common/pi/agesawrapper.c
index 1859801..8ee962b 100644
--- a/src/soc/amd/common/pi/agesawrapper.c
+++ b/src/soc/amd/common/pi/agesawrapper.c
@@ -78,7 +78,7 @@
 	status = module_dispatch(AMD_CREATE_STRUCT, &aip->StdHeader);
 
 	if (status != AGESA_SUCCESS) {
-		printk(BIOS_ERR, "Error: AmdCreateStruct() for 0x%x returned 0x%x. "
+		printk(BIOS_ERR, "AmdCreateStruct() for 0x%x returned 0x%x. "
 				"Proper system initialization may not be possible.\n",
 				aip->AgesaFunctionName, status);
 	}