rpi: Switch to OF_HAS_PRIOR_STAGE by default

On all Raspberry Pi platforms, we're loaded by a prior stage firmware
that has assembled and passed on a device tree binary for us to use.
Switch to using this tree by default.

Cc: Matthias Brugger <mbrugger@suse.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: François Ozog <francois.ozog@linaro.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 93e12d8..38fc757 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -653,6 +653,7 @@
 	select SERIAL_SEARCH_ALL
 	imply CMD_DM
 	imply FAT_WRITE
+	imply OF_HAS_PRIOR_STAGE
 
 config ARCH_BCMSTB
 	bool "Broadcom BCM7XXX family"
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index 6ce278c..b3287ce 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -163,7 +163,6 @@
 
 	  This option creates a build targeting the ARMv7/AArch32 ISA.
 	select BCM2711_32B
-	imply OF_HAS_PRIOR_STAGE
 
 config TARGET_RPI_4
 	bool "Raspberry Pi 4 64-bit build"
@@ -189,7 +188,6 @@
 
 	  This option creates a build targeting the ARMv8/AArch64 ISA.
 	select BCM2711_64B
-	imply OF_HAS_PRIOR_STAGE
 
 config TARGET_RPI_ARM64
 	bool "Raspberry Pi one binary 64-bit build"
@@ -197,7 +195,6 @@
 	  Support for all armv8 based Raspberry Pi variants, such as
 	  the RPi 4 model B, in AArch64 (64-bit) mode.
 	select ARM64
-	imply OF_HAS_PRIOR_STAGE
 
 endchoice