arm-trusted-firmware-bcm63xx: add ATF for Broadcom devices

Right now it includes bcm4908 variant only that is required by BCM4908
family devices with U-Boot.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

package/boot/arm-trusted-firmware-bcm63xx/Makefile

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0
+
+include $(TOPDIR)/rules.mk
+
+PKG_VERSION:=2.2
+PKG_RELEASE:=$(AUTORELEASE)
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/bcm63xx/atf.git
+PKG_SOURCE_DATE:=2021-12-24
+PKG_SOURCE_VERSION:=e6d46baf3fae79f693f90bf34f7284c3dfc64aef
+PKG_MIRROR_HASH:=9d5d04f572b1b6ddc6eb3064b9cb09f5fe982e82d350790041d35316349af124
+
+PKG_MAINTAINER:=Rafał Miłecki <rafal@milecki.pl>
+
+include $(INCLUDE_DIR)/trusted-firmware-a.mk
+include $(INCLUDE_DIR)/package.mk
+
+define Trusted-Firmware-A/Default
+  PLAT:=bcm
+  DEFAULT:=y
+endef
+
+define Trusted-Firmware-A/bcm4908
+  BUILD_TARGET:=bcm4908
+  NAME:=BCM4908
+  BRCM_CHIP=4908
+  TFA_IMAGE:=bl31.bin
+endef
+
+TFA_TARGETS:= \
+	bcm4908
+
+TFA_MAKE_FLAGS += \
+	BRCM_CHIP=$(BRCM_CHIP)
+
+define Package/trusted-firmware-a/install
+	$(INSTALL_DIR) $(STAGING_DIR_IMAGE)
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/build/$(PLAT)/release/$(TFA_IMAGE) $(STAGING_DIR_IMAGE)/
+endef
+
+$(eval $(call BuildPackage/Trusted-Firmware-A))