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/commonlib/storage/sd_mmc.h

@@ -71,7 +71,7 @@ int sd_set_partition(struct storage_media *media,
 		if (CONFIG(SDHC_TRACE))	\
 			printk(BIOS_DEBUG, format);	\
 	} while (0)
-#define sdhc_error(format...) printk(BIOS_ERR, "ERROR: " format)
+#define sdhc_error(format...) printk(BIOS_ERR, format)
 
 /* Card/device debug functions */
 #define sd_mmc_debug(format...) \
@@ -84,6 +84,6 @@ int sd_set_partition(struct storage_media *media,
 		if (CONFIG(SD_MMC_TRACE))	\
 			printk(BIOS_DEBUG, format);	\
 	} while (0)
-#define sd_mmc_error(format...) printk(BIOS_ERR, "ERROR: " format)
+#define sd_mmc_error(format...) printk(BIOS_ERR, format)
 
 #endif /* __COMMONLIB_STORAGE_SD_MMC_H__ */