powerpc: Don't export cvt_fd & _df when CONFIG_PPC_FPU is not set

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/ppc_ksyms.c

@@ -101,7 +101,7 @@ EXPORT_SYMBOL(pci_dram_offset);
 EXPORT_SYMBOL(start_thread);
 EXPORT_SYMBOL(kernel_thread);
 
-#ifndef CONFIG_BOOKE
+#ifdef CONFIG_PPC_FPU
 EXPORT_SYMBOL_GPL(cvt_df);
 EXPORT_SYMBOL_GPL(cvt_fd);
 #endif