arch/parisc: Remove trailing whitespaces

Fix trailing whitespaces. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230417125651.25126-13-tzimmermann@suse.de

arch/parisc/Makefile

@@ -11,7 +11,7 @@
 # Copyright (C) 1994 by Linus Torvalds
 # Portions Copyright (C) 1999 The Puffin Group
 #
-# Modified for PA-RISC Linux by Paul Lahaie, Alex deVries, 
+# Modified for PA-RISC Linux by Paul Lahaie, Alex deVries,
 # Mike Shaver, Helge Deller and Martin K. Petersen
 #