Nokia RX-51: Move board required options from defconfig to Kconfig

Some of config options are board specific and should be set in into their
default values automatically. So move them from defconfig file to Kconfig
definitions to ensure that possible user custom defconfig files would have
these required options also enabled.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/arch/arm/mach-omap2/omap3/Kconfig b/arch/arm/mach-omap2/omap3/Kconfig
index 18574ab..3e97ec2 100644
--- a/arch/arm/mach-omap2/omap3/Kconfig
+++ b/arch/arm/mach-omap2/omap3/Kconfig
@@ -108,6 +108,11 @@
 config TARGET_NOKIA_RX51
 	bool "Nokia RX51"
 	select POSITION_INDEPENDENT
+	select SKIP_LOWLEVEL_INIT
+	select SUPPORT_PASSING_ATAGS
+	select CMDLINE_TAG
+	select INITRD_TAG
+	select REVISION_TAG
 
 config TARGET_TAO3530
 	bool "TAO3530"
diff --git a/board/nokia/rx51/Kconfig b/board/nokia/rx51/Kconfig
index ec6a571..7cf0507 100644
--- a/board/nokia/rx51/Kconfig
+++ b/board/nokia/rx51/Kconfig
@@ -1,5 +1,8 @@
 if TARGET_NOKIA_RX51
 
+config NR_DRAM_BANKS
+	default 2
+
 config SYS_BOARD
 	default "rx51"
 
@@ -9,4 +12,7 @@
 config SYS_CONFIG_NAME
 	default "nokia_rx51"
 
+config SYS_PROMPT
+	default "Nokia RX-51 # "
+
 endif
diff --git a/configs/nokia_rx51_defconfig b/configs/nokia_rx51_defconfig
index 1306c1f..b25e33e 100644
--- a/configs/nokia_rx51_defconfig
+++ b/configs/nokia_rx51_defconfig
@@ -1,16 +1,10 @@
 CONFIG_ARM=y
-CONFIG_SKIP_LOWLEVEL_INIT=y
 # CONFIG_SYS_THUMB_BUILD is not set
 CONFIG_SYS_L2CACHE_OFF=y
 CONFIG_ARCH_OMAP2PLUS=y
-CONFIG_SUPPORT_PASSING_ATAGS=y
-CONFIG_CMDLINE_TAG=y
-CONFIG_INITRD_TAG=y
-CONFIG_REVISION_TAG=y
 CONFIG_STATIC_MACH_TYPE=y
 CONFIG_MACH_TYPE=1955
 CONFIG_SYS_MALLOC_LEN=0xc0000
-CONFIG_NR_DRAM_BANKS=2
 CONFIG_TARGET_NOKIA_RX51=y
 CONFIG_SYS_LOAD_ADDR=0x80000000
 CONFIG_OPTIMIZE_INLINING=y
@@ -25,7 +19,6 @@
 CONFIG_USE_PREBOOT=y
 # CONFIG_SYS_DEVICE_NULLDEV is not set
 CONFIG_HUSH_PARSER=y
-CONFIG_SYS_PROMPT="Nokia RX-51 # "
 CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=287
 # CONFIG_CMD_BDI is not set