selftests/powerpc/dexcr: Fix spelling mistake "predicition" -> "prediction"

There is a spelling mistake in the help message. Fix it.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

tools/testing/selftests/powerpc/dexcr/chdexcr.c

···
 	       "\n"
 	       "The normal option sets the aspect in the DEXCR. The --no- variant\n"
 	       "clears that aspect. For example, --ibrtpd sets the IBRTPD aspect bit,\n"
-	       "so indirect branch predicition will be disabled in the provided program.\n"
+	       "so indirect branch prediction will be disabled in the provided program.\n"
 	       "Conversely, --no-ibrtpd clears the aspect bit, so indirect branch\n"
 	       "prediction may occur.\n"
 	       "\n"