configs: dra7xx-evm: increase the size of the malloc's pool before relocation

This is required to take advantage of MULTI_DTB_FIT before relocation.
If it is too low, DM will be initialized only after relocation has
taken place. That is too late for the DRA7 because I2C DM is used before
the relocation to setup the voltages required, among other things, to
properly initialize the DRAM.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/dra7xx_evm_defconfig b/configs/dra7xx_evm_defconfig
index 27f6b5d..a57dc07 100644
--- a/configs/dra7xx_evm_defconfig
+++ b/configs/dra7xx_evm_defconfig
@@ -1,7 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_TI_COMMON_CMD_OPTIONS=y
-CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_SYS_MALLOC_F_LEN=0x18000
 CONFIG_OMAP54XX=y
 CONFIG_TARGET_DRA7XX_EVM=y
 CONFIG_SPL=y