of: clean-up unnecessary libfdt include paths

With the libfdt include fixups to use "" instead of <> in the
latest dtc import in commit 4760597 (scripts/dtc: Update to upstream
version 9d3649bd3be245c9), it is no longer necessary to add explicit
include paths to use libfdt. Remove these across the kernel.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Grant Likely <grant.likely@linaro.org>
Cc: linux-mips@linux-mips.org
Cc: linuxppc-dev@lists.ozlabs.org

arch/mips/cavium-octeon/Makefile

@@ -9,9 +9,6 @@
 # Copyright (C) 2005-2009 Cavium Networks
 #
 
-CFLAGS_octeon-platform.o = -I$(src)/../../../scripts/dtc/libfdt
-CFLAGS_setup.o = -I$(src)/../../../scripts/dtc/libfdt
-
 obj-y := cpu.o setup.o octeon-platform.o octeon-irq.o csrc-octeon.o
 obj-y += dma-octeon.o
 obj-y += octeon-memcpy.o

arch/mips/mti-sead3/Makefile

@@ -15,5 +15,3 @@ obj-y				:= sead3-lcd.o sead3-display.o sead3-init.o \
 obj-y				+= leds-sead3.o
 
 obj-$(CONFIG_EARLY_PRINTK)	+= sead3-console.o
-
-CFLAGS_sead3-setup.o = -I$(src)/../../../scripts/dtc/libfdt

arch/powerpc/kernel/Makefile

@@ -2,7 +2,6 @@
 # Makefile for the linux kernel.
 #
 
-CFLAGS_prom.o		= -I$(src)/../../../scripts/dtc/libfdt
 CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"'
 
 subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror

drivers/firmware/efi/libstub/Makefile

@@ -24,8 +24,6 @@ KASAN_SANITIZE			:= n
 lib-y				:= efi-stub-helper.o
 lib-$(CONFIG_EFI_ARMSTUB)	+= arm-stub.o fdt.o
 
-CFLAGS_fdt.o			+= -I$(srctree)/scripts/dtc/libfdt/
-
 #
 # arm64 puts the stub in the kernel proper, which will unnecessarily retain all
 # code indefinitely unless it is annotated as __init/__initdata/__initconst etc.

drivers/of/Makefile

@@ -16,6 +16,3 @@ obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
-
-CFLAGS_fdt.o = -I$(src)/../../scripts/dtc/libfdt
-CFLAGS_fdt_address.o = -I$(src)/../../scripts/dtc/libfdt