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/intel/braswell/southcluster.c b/src/soc/intel/braswell/southcluster.c
index 25868640..4c6cbee 100644
--- a/src/soc/intel/braswell/southcluster.c
+++ b/src/soc/intel/braswell/southcluster.c
@@ -106,7 +106,7 @@
 	const struct soc_irq_route *ir = &global_soc_irq_route;
 
 	if (ir == NULL) {
-		printk(BIOS_WARNING, "Warning: Can't write PCI IRQ assignments "
+		printk(BIOS_WARNING, "Can't write PCI IRQ assignments "
 			"because 'global_braswell_irq_route' structure does not exist\n");
 		return;
 	}
@@ -142,8 +142,7 @@
 		device_num = PCI_SLOT(parent_bdf);
 
 		if (ir->pcidev[device_num] == 0) {
-			printk(BIOS_WARNING,
-				"Warning: PCI Device %d does not have an IRQ entry, "
+			printk(BIOS_WARNING, "PCI Device %d does not have an IRQ entry, "
 				"skipping it\n", device_num);
 			continue;
 		}