meta-multimedia: fix trailing whitespace

Fix trailing whitespace in meta-multimedia layer.conf to resolve
bitbake parsing warnings.

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-multimedia/conf/layer.conf

@@ -5,7 +5,7 @@
 # Therefore if you want a given layer to be considered high priority
 # for the .inc and .conf etc. then consider it adding at the beginning
 # of BBPATH. For bblayers bitbake will use BBFILES_PRIORITY to resolve
-# the recipe contention so the order of directories in BBFILES does 
+# the recipe contention so the order of directories in BBFILES does
 # not matter.
 
 # We have a conf and classes directory, append to BBPATH