armv8/layerscape: remove unnecessary function declares

For the function alloc_stream_ids() append_mmu_masters() and
fdt_fixup_smmu_pcie() there are no related definitions and they
are never called. So the patch removes the unnecessary declares.

Signed-off-by: Minghuan Lian <Minghuan.Lian@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/fdt.h b/arch/arm/include/asm/arch-fsl-layerscape/fdt.h
index 099563e..537486d 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/fdt.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/fdt.h
@@ -7,9 +7,5 @@
 #ifndef _ASM_ARMV8_FSL_LAYERSCAPE_FDT_H_
 #define _ASM_ARMV8_FSL_LAYERSCAPE_FDT_H_
 
-void alloc_stream_ids(int start_id, int count, u32 *stream_ids, int max_cnt);
-void append_mmu_masters(void *blob, const char *smmu_path,
-			const char *master_name, u32 *stream_ids, int count);
-void fdt_fixup_smmu_pcie(void *blob);
 void fdt_fixup_board_enet(void *fdt);
 #endif	/* _ASM_ARMV8_FSL_LAYERSCAPE_FDT_H_ */