firmware: delete in-kernel firmware

The last firmware change for the in-kernel firmware source code was back
in 2013.  Everyone has been relying on the out-of-tree linux-firmware
package for a long long time.

So let's drop it, it's baggage we don't need to keep dragging around
(and having to fix random kbuild issues over time...)

Cc: Kyle McMartin <kyle@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Makefile

@@ -562,7 +562,7 @@ scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 
 # Objects we will link into vmlinux / subdirs we need to visit
 init-y		:= init/
-drivers-y	:= drivers/ sound/ firmware/
+drivers-y	:= drivers/ sound/
 net-y		:= net/
 libs-y		:= lib/
 core-y		:= usr/
@@ -1128,16 +1128,6 @@ headerdep:
 	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
 
-# ---------------------------------------------------------------------------
-# Firmware install
-INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
-export INSTALL_FW_PATH
-
-PHONY += firmware_install
-firmware_install:
-	@mkdir -p $(objtree)/firmware
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
-
 # ---------------------------------------------------------------------------
 # Kernel headers
 
@@ -1216,7 +1206,6 @@ modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 	@$(kecho) '  Building modules, stage 2.';
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 
 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
@@ -1252,7 +1241,6 @@ _modinst_:
 # boot script depmod is the master version.
 PHONY += _modinst_post
 _modinst_post: _modinst_
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 	$(call cmd,depmod)
 
 ifeq ($(CONFIG_MODULE_SIG), y)
@@ -1375,8 +1363,6 @@ help:
 	@echo  '* vmlinux	  - Build the bare kernel'
 	@echo  '* modules	  - Build all modules'
 	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
-	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
-	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
 	@echo  '  dir/            - Build all files in dir and below'
 	@echo  '  dir/file.[ois]  - Build specified target only'
 	@echo  '  dir/file.ll     - Build the LLVM assembly file'