rockchip: make boot_rkimg.c as basic mandory code

boot_rkimg.c is the basic code for rockchip platforms, such as
get boot devtype, setup download mode and get kernel dtb, etc.

CONFIG_RKIMG_BOOTLOADER actually makes no sense for rockchip
features any more, but we still leave it to compatile code
compilation since there is a lot of code depends on it. but it
maybe dropped in the future.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: Iab922cbf3a70e7eb1444678d6e902b9d8e106dd1

arch/arm/mach-rockchip/Kconfig

@@ -546,14 +546,10 @@ config SPL_MMC_SUPPORT
 	default y if !SPL_ROCKCHIP_BACK_TO_BROM
 
 config RKIMG_BOOTLOADER
-	bool "Support for Rockchip Image Bootloader boot flow"
-	default n
+	bool "Support for Rockchip platform features"
+	default y
 	help
-	  Rockchip use this to boot Android during development cycle and for
-	  other OS, typical content kernel.img with zImage/Image, boot.img and
-	  recovery.img with Ramdisk, packed with 'KNRL' header; and resource.img
-	  with dtb and uboot/kernel logo bmp, vendor storage for custom info
-	  like SN and MAC address.
+	  Actually this is a compatible configure for code compilation.
 
 config RKIMG_ANDROID_BOOTMODE_LEGACY
 	bool "Support set androidboot.mode with legacy rule"

arch/arm/mach-rockchip/Makefile

@@ -21,6 +21,7 @@ ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 # we can have the preprocessor correctly recognise both 0x0 and 0
 # meaning "turn it off".
 obj-y += boot_mode.o
+obj-y += boot_rkimg.o
 obj-y += board.o
 obj-y += chip_info.o
 obj-y += iomem.o

common/Makefile

@@ -127,10 +127,6 @@ ifdef CONFIG_CMD_DTIMG
 obj-y += image-android-dt.o
 endif
 
-ifndef CONFIG_TPL_BUILD
-obj-$(CONFIG_RKIMG_BOOTLOADER) += boot_rkimg.o
-endif
-
 ifndef CONFIG_SPL_BUILD
 # This option is not just y/n - it can have a numeric value
 ifdef CONFIG_FASTBOOT_FLASH