arm64: zynqmp: Move TCM initialization to a separate routine

This patch moves TCM initialization to a separate routine to
make it modular and can be reused if required. It also prints
warning message now as it writes to TCM.
Signed-off-by: NSiva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/cpu/armv8/zynqmp/cpu.c

@@ -105,10 +105,16 @@ u64 get_page_table_size(void)
 }
 
 #ifdef CONFIG_SYS_MEM_RSVD_FOR_MMU
-int reserve_mmu(void)
+static void tcm_init(u8 mode)
 {
-	initialize_tcm(TCM_LOCK);
+	puts("WARNING: Initializing TCM overwrites TCM content\n");
+	initialize_tcm(mode);
 	memset((void *)ZYNQMP_TCM_BASE_ADDR, 0, ZYNQMP_TCM_SIZE);
+}
+
+int reserve_mmu(void)
+{
+	tcm_init(TCM_LOCK);
 	gd->arch.tlb_size = PGTABLE_SIZE;
 	gd->arch.tlb_addr = ZYNQMP_TCM_BASE_ADDR;