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/misc_s10.c b/arch/arm/mach-socfpga/misc_s10.c
index 1849e53..a3f5b43 100644
--- a/arch/arm/mach-socfpga/misc_s10.c
+++ b/arch/arm/mach-socfpga/misc_s10.c
@@ -65,7 +65,7 @@
 	else
 		return -EINVAL;
 
-	clrsetbits_le32(socfpga_get_sysmgr_addr() + SYSMGR_S10_EMAC0 +
+	clrsetbits_le32(socfpga_get_sysmgr_addr() + SYSMGR_SOC64_EMAC0 +
 			gmac_index,
 			SYSMGR_EMACGRP_CTRL_PHYSEL_MASK, modereg);