Convert CONFIG_SPL_RELOC_TEXT_BASE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_RELOC_TEXT_BASE
   CONFIG_SPL_RELOC_STACK
   CONFIG_SPL_RELOC_MALLOC_ADDR
   CONFIG_SPL_RELOC_MALLOC_SIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/P2020RDB-PC_36BIT_SPIFLASH_defconfig b/configs/P2020RDB-PC_36BIT_SPIFLASH_defconfig
index 6150b84..7a198e0 100644
--- a/configs/P2020RDB-PC_36BIT_SPIFLASH_defconfig
+++ b/configs/P2020RDB-PC_36BIT_SPIFLASH_defconfig
@@ -35,6 +35,10 @@
 CONFIG_SPL_SPI_BOOT=y
 CONFIG_SPL_SYS_CCSR_DO_NOT_RELOCATE=y
 CONFIG_SPL_FLUSH_IMAGE=y
+CONFIG_SPL_RELOC_STACK=0xf8f9d000
+CONFIG_SPL_RELOC_MALLOC=y
+CONFIG_SPL_RELOC_MALLOC_ADDR=0xf8fa5000
+CONFIG_SPL_RELOC_MALLOC_SIZE=0x5b000
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_I2C=y
 CONFIG_SPL_MPC8XXX_INIT_DDR=y