package/psplash: bump to revision fd33a9b

package/psplash: bump to revision fd33a9b

This includes the following changes:

66c8f65 Makefile.am: use BUILT_SOURCES instead of BUILD_SOURCES
f7a354d Generate image headers from their PNG source, while still including them in dist tarball
983837e Import png source for images, extracted from headers
3bd1557 Cleanup poky logo
773a397 Add configure flags for fullscreen logo and no startup message
2913c24 Double buffering support
8188d68 Support --with-font configure option to use other font headers
88c4b71 Add SPDX License information to files, drop boilerplate
904f4aa add systemd support
e94bd11 process consecutive commands
568f28e use /run for communication FIFO
ee053e0 add recovered bar.png
2015f70 Fix text width calculation.

Also:
 - remove the 'psplash-quit.service' unit file
 - add 'psplash-systemd.service' to use the new systemd support in psplash

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>