arm: socfpga: Move Stratix10 and Agilex system manager common code

Move Stratix10 and Agilex system manager common code to
system_manager_soc64.h. Changed macros to use SYSMGR_SOC64_*.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/arch/arm/mach-socfpga/clock_manager_s10.c b/arch/arm/mach-socfpga/clock_manager_s10.c
index 5edeab1..05e4212 100644
--- a/arch/arm/mach-socfpga/clock_manager_s10.c
+++ b/arch/arm/mach-socfpga/clock_manager_s10.c
@@ -385,7 +385,8 @@
 
 unsigned int cm_get_qspi_controller_clk_hz(void)
 {
-	return readl(socfpga_get_sysmgr_addr() + SYSMGR_S10_BOOT_SCRATCH_COLD0);
+	return readl(socfpga_get_sysmgr_addr() +
+		     SYSMGR_SOC64_BOOT_SCRATCH_COLD0);
 }
 
 unsigned int cm_get_spi_controller_clk_hz(void)