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/drivers/i2c/max98390/max98390.c

@@ -73,7 +73,7 @@ static void max98390_fill_ssdt(const struct device *dev)
 					CONFIG_MAINBOARD_PART_NUMBER);
 
 			if (chars >= sizeof(dsm_name))
-				printk(BIOS_ERR, "ERROR: String too long in %s\n", __func__);
+				printk(BIOS_ERR, "String too long in %s\n", __func__);
 
 			acpi_dp_add_string(dp, "maxim,dsm_param_name", dsm_name);
 		}

src/drivers/i2c/tpm/cr50.c

@@ -49,7 +49,7 @@ __weak int tis_plat_irq_status(void)
 	static int warning_displayed;
 
 	if (!warning_displayed) {
-		printk(BIOS_WARNING, "WARNING: %s() not implemented, wasting 20ms to wait on"
+		printk(BIOS_WARNING, "%s() not implemented, wasting 20ms to wait on"
 		       " Cr50!\n", __func__);
 		warning_displayed = 1;
 	}