psplash: Set a higher priority for psplash-oniro

This fixes build warning:

[log_check] Warn: update-alternatives: psplash has multiple providers
with the same priority

It is a workaround as the actual behaviour is yet to be understood.
There seems to be a bug or an uninteded behaviour where multiple psplash
binaries get installed (having the same priority for the psplash
symlink).

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/recipes-core/psplash/psplash_%.bbappend

@@ -4,6 +4,7 @@
 
 FILESEXTRAPATHS_prepend := "${ONIRO_COREBASE}/assets:"
 SPLASH_IMAGES_append = " file://psplash-oniro-img.png;outsuffix=oniro"
+ALTERNATIVE_PRIORITY_psplash-oniro[psplash] = "200"
 
 EXTRA_OECONF += "--enable-img-fullscreen --disable-startup-msg --disable-progress-bar"