selftests/powerpc: Fix spelling mistake "EACCESS" -> "EACCES"

There is a spelling mistake of the EACCES error name, fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231215112456.13554-1-colin.i.king@gmail.com

tools/testing/selftests/powerpc/papr_sysparm/papr_sysparm.c

@@ -177,7 +177,7 @@ static const struct sysparm_test sysparm_tests[] = {
 	},
 	{
 		.function = set_with_ro_fd,
-		.description = "PAPR_IOC_SYSPARM_SET returns EACCESS on read-only fd",
+		.description = "PAPR_IOC_SYSPARM_SET returns EACCES on read-only fd",
 	},
 };