socfpga: stratix10: fix sdram_calculate_size

Incorrect type of size variable results in 0 being
returned for sdram sizes greater than or equal to
4GB.

Signed-off-by: Dalon Westergreen <dwesterg@gmail.com>
diff --git a/drivers/ddr/altera/sdram_s10.c b/drivers/ddr/altera/sdram_s10.c
index 48f4f47..a48567c 100644
--- a/drivers/ddr/altera/sdram_s10.c
+++ b/drivers/ddr/altera/sdram_s10.c
@@ -371,11 +371,11 @@
  * Calculate SDRAM device size based on SDRAM controller parameters.
  * Size is specified in bytes.
  */
-unsigned long sdram_calculate_size(void)
+phys_size_t sdram_calculate_size(void)
 {
 	u32 dramaddrw = hmc_readl(DRAMADDRW);
 
-	u32 size = 1 << (DRAMADDRW_CFG_CS_ADDR_WIDTH(dramaddrw) +
+	phys_size_t size = 1 << (DRAMADDRW_CFG_CS_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_BANK_GRP_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_BANK_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_ROW_ADDR_WIDTH(dramaddrw) +