armv7R: K3: am654: Use full malloc implementation in SPL

Switch to using the full malloc scheme in post-relocation SPL to allow
better utilization of available memory for example by allowing memory
to get freed. Initially allocate a 16MB-sized region in DDR starting
at address 0x84000000 for this purpose.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
diff --git a/include/configs/am65x_evm.h b/include/configs/am65x_evm.h
index 1319745..ea365b9 100644
--- a/include/configs/am65x_evm.h
+++ b/include/configs/am65x_evm.h
@@ -41,6 +41,9 @@
 					 CONFIG_SPL_BSS_MAX_SIZE)
 /* Set the stack right below the SPL BSS section */
 #define CONFIG_SYS_INIT_SP_ADDR         CONFIG_SPL_BSS_START_ADDR
+/* Configure R5 SPL post-relocation malloc pool in DDR */
+#define CONFIG_SYS_SPL_MALLOC_START	0x84000000
+#define CONFIG_SYS_SPL_MALLOC_SIZE	SZ_16M
 #endif
 
 #ifdef CONFIG_SYS_K3_SPL_ATF