SAMV7: Costmetic changes to SDRAM logic

configs/samv71-xult/src/sam_sdram.c

@@ -206,6 +206,8 @@ void sam_sdram_config(void)
    *    the Low Power Register.
    */
 
+  putreg32(0, SAM_SDRAMC_LPR);
+
   /* 3. The SDRAM memory type must be set in the Memory Device Register.*/
 
   putreg32(SDRAMC_MDR_SDRAM, SAM_SDRAMC_MDR);