configs: am65x_evm_a53: Increase malloc pool before relocation

The malloc pool used before relocation is getting tight leading to
out of memory errors doing certain DM-related calls. Since we are
running the A53 SPL out of DDR let's just go ahead and bump its size
as used in U-Boot proper as well as SPL (via Kconfig default value)
from 8KB to 32KB.
Signed-off-by: NAndreas Dannenberg <dannenberg@ti.com>
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>

configs/am65x_evm_a53_defconfig

@@ -2,7 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_K3=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
-CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_SYS_MALLOC_F_LEN=0x8000
 CONFIG_SOC_K3_AM6=y
 CONFIG_TARGET_AM654_A53_EVM=y
 CONFIG_SPL_MMC_SUPPORT=y