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

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

···
 	},
 	{
 		.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",
 	},
 };