openrisc: migrate to the generic rule for built-in DTB

Commit 654102df2ac2 ("kbuild: add generic support for built-in boot
DTBs") introduced generic support for built-in DTBs.

Select GENERIC_BUILTIN_DTB to use the generic rule.

To keep consistency across architectures, this commit also renames
CONFIG_OPENRISC_BUILTIN_DTB_NAME to CONFIG_BUILTIN_DTB_NAME.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Stafford Horne <[e-mail]>

arch/openrisc/Kbuild

···
 # SPDX-License-Identifier: GPL-2.0
 obj-y += lib/ kernel/ mm/
-obj-y += boot/dts/
 
 # for cleaning
 subdir- += boot

arch/openrisc/Kconfig

···
 	select ARCH_HAS_DMA_SET_UNCACHED
 	select ARCH_HAS_DMA_CLEAR_UNCACHED
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select GENERIC_BUILTIN_DTB
 	select COMMON_CLK
 	select OF
 	select OF_EARLY_FLATTREE
···
 
 	  If unsure say N here
 
-config OPENRISC_BUILTIN_DTB
+config BUILTIN_DTB_NAME
 	string "Builtin DTB"
 	default ""
 

arch/openrisc/boot/dts/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
-obj-y += $(addsuffix .dtb.o, $(CONFIG_OPENRISC_BUILTIN_DTB))
+dtb-y += $(addsuffix .dtb, $(CONFIG_BUILTIN_DTB_NAME))
 
 #DTC_FLAGS ?= -p 1024

arch/openrisc/configs/or1klitex_defconfig

···
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_SGETMASK_SYSCALL=y
 CONFIG_EXPERT=y
-CONFIG_OPENRISC_BUILTIN_DTB="or1klitex"
+CONFIG_BUILTIN_DTB_NAME="or1klitex"
 CONFIG_HZ_100=y
 CONFIG_OPENRISC_HAVE_SHADOW_GPRS=y
 CONFIG_NET=y

arch/openrisc/configs/or1ksim_defconfig

···
 CONFIG_SLUB_TINY=y
 CONFIG_MODULES=y
 # CONFIG_BLOCK is not set
-CONFIG_OPENRISC_BUILTIN_DTB="or1ksim"
+CONFIG_BUILTIN_DTB_NAME="or1ksim"
 CONFIG_HZ_100=y
 CONFIG_NET=y
 CONFIG_PACKET=y

arch/openrisc/configs/simple_smp_defconfig

···
 CONFIG_SLUB_TINY=y
 CONFIG_MODULES=y
 # CONFIG_BLOCK is not set
-CONFIG_OPENRISC_BUILTIN_DTB="simple_smp"
+CONFIG_BUILTIN_DTB_NAME="simple_smp"
 CONFIG_SMP=y
 CONFIG_HZ_100=y
 CONFIG_OPENRISC_HAVE_SHADOW_GPRS=y