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/spi/tpm/tpm.c

@@ -74,7 +74,7 @@ __weak int tis_plat_irq_status(void)
 	static int warning_displayed;
 
 	if (!warning_displayed) {
-		printk(BIOS_WARNING, "WARNING: %s() not implemented, wasting 10ms to wait on"
+		printk(BIOS_WARNING, "%s() not implemented, wasting 10ms to wait on"
 		       " Cr50!\n", __func__);
 		warning_displayed = 1;
 	}
@@ -492,7 +492,7 @@ static void cr50_set_board_cfg(void)
 		/* The high bit is set, meaning that the Cr50 is already locked on a particular
 		 * value for the register, but not the one we wanted. */
 		printk(BIOS_ERR,
-		       "ERROR: Current CR50_BOARD_CFG = 0x%08x, does not match desired = 0x%08x\n",
+		       "Current CR50_BOARD_CFG = 0x%08x, does not match desired = 0x%08x\n",
 		       board_cfg_value, CR50_BOARD_CFG_VALUE);
 		return;
 	}