Convert CONFIG_CONS_INDEX et al to Kconfig

This converts the following to Kconfig:
   CONFIG_CONS_INDEX
   CONFIG_DEBUG_UART_CLOCK
   CONFIG_FSL_TZPC_BP147
   CONFIG_GENERIC_ATMEL_MCI
   CONFIG_IDENT_STRING
   CONFIG_LIBATA
   CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE
   CONFIG_LPC32XX_GPIO
   CONFIG_MP
   CONFIG_MPC8XXX_GPIO
   CONFIG_MTD_PARTITIONS
   CONFIG_MVGBE
   CONFIG_MXC_GPIO
   CONFIG_NR_DRAM_BANKS
   CONFIG_OF_BOARD_SETUP
   CONFIG_OF_STDOUT_VIA_ALIAS
   CONFIG_OF_SYSTEM_SETUP
   CONFIG_PREBOOT
   CONFIG_ROCKCHIP_SERIAL
   CONFIG_RTC_ENABLE_32KHZ_OUTPUT
   CONFIG_RTC_MV
   CONFIG_SCSI_AHCI
   CONFIG_SF_DEFAULT_BUS
   CONFIG_SF_DEFAULT_CS
   CONFIG_SF_DEFAULT_SPEED
   CONFIG_SOFT_SPI
   CONFIG_SPI_FLASH_EON
   CONFIG_SPI_FLASH_MACRONIX
   CONFIG_SPI_FLASH_MTD
   CONFIG_SPI_FLASH_SPANSION
   CONFIG_SPI_FLASH_SST
   CONFIG_SPI_FLASH_STMICRO
   CONFIG_SUPPORT_RAW_INITRD
   CONFIG_SYS_ARCH_TIMER
   CONFIG_SYS_BOARD
   CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
   CONFIG_SYS_DCACHE_OFF
   CONFIG_SYS_FDT_SAVE_ADDRESS
   CONFIG_SYS_FLASH_CFI
   CONFIG_SYS_FSL_ERRATUM_ESDHC135
   CONFIG_SYS_HAS_SERDES
   CONFIG_SYS_L2CACHE_OFF
   CONFIG_SYS_LITTLE_ENDIAN
   CONFIG_SYS_LOAD_ADDR
   CONFIG_SYS_MMCSD_FS_BOOT_PARTITION
   CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
   CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
   CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
   CONFIG_SYS_NS16550
   CONFIG_SYS_PLLFIN
   CONFIG_SYS_SPI_U_BOOT_OFFS
   CONFIG_TIMER_SYS_TICK_CH
   CONFIG_USB_EHCI_FSL
   CONFIG_U_QE
   CONFIG_VERSION_VARIABLE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/a5y17lte_defconfig b/configs/a5y17lte_defconfig
index 2d8782e..2534ab0 100644
--- a/configs/a5y17lte_defconfig
+++ b/configs/a5y17lte_defconfig
@@ -9,6 +9,8 @@
 CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
 CONFIG_SYS_LOAD_ADDR=0x40001000
 CONFIG_FIT=y
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="echo Read pressed buttons status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN $PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER; then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_GPIO=y