spl/tpl: change banner into upper case

commit d6330064634a ("spl: Add a define for SPL_TPL_PROMPT")

changes the SPL/TPL banner from upper case into lower
case. As SPL and TPL are three-letter acronyms and they
are written in upper case, change it back to upper case.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/u_boot_console_base.py b/test/py/u_boot_console_base.py
index e044eb3..326b2ac 100644
--- a/test/py/u_boot_console_base.py
+++ b/test/py/u_boot_console_base.py
@@ -16,7 +16,7 @@
 import u_boot_spawn
 
 # Regexes for text we expect U-Boot to send to the console.
-pattern_u_boot_spl_signon = re.compile('(U-Boot spl \\d{4}\\.\\d{2}[^\r\n]*\\))')
+pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}[^\r\n]*\\))')
 pattern_u_boot_main_signon = re.compile('(U-Boot \\d{4}\\.\\d{2}[^\r\n]*\\))')
 pattern_stop_autoboot_prompt = re.compile('Hit any key to stop autoboot: ')
 pattern_unknown_command = re.compile('Unknown command \'.*\' - try \'help\'')