[U-Boot] "splash: fix splash banner output" and newer llvm-7

[Tom Rini]

Hey,

With a patch to fix Travis-CI so that it actually uses LLVM-7 to build,
I see I've let in a problem (the LLVM-7 I use locally is older and
didn't catch it) with:
commit d2a8271c88514f30c2fe00d2584401348f39c3d4
Author: Anatolij Gustschin <agust at denx.de>
Date:   Fri Sep 20 17:23:41 2019 +0200

    splash: fix splash banner output
    
    Old splash code in cfb_console driver displayed U-Boot version
    string by default. Restore this behaviour for DM_VIDEO enabled
    configurations.
    
    Signed-off-by: Anatolij Gustschin <agust at denx.de>
    Reported-by: Fabio Estevam <festevam at gmail.com>

which from https://travis-ci.org/trini/u-boot/jobs/604644412
is:
+common/splash.c:148:20: error: unused function 'splash_display_banner' [-Werror,-Wunused-function]
+static inline void splash_display_banner(void) { }
+                   ^
+1 error generated.
+make[2]: *** [common/splash.o] Error 1
+make[1]: *** [common] Error 2
+make: *** [sub-make] Error 2

Can you please take a look?  Thanks!

-- 
Tom
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