arm: socfpga: Move Stratix10 and Agilex to use TARGET_SOCFPGA_SOC64

Create common macro TARGET_SOCFPGA_SOC64 for Stratix10 and Agilex.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d51abbe..3307f2b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -970,7 +970,7 @@
 	bool "Altera SOCFPGA family"
 	select ARCH_EARLY_INIT_R
 	select ARCH_MISC_INIT if !TARGET_SOCFPGA_ARRIA10
-	select ARM64 if TARGET_SOCFPGA_STRATIX10 || TARGET_SOCFPGA_AGILEX
+	select ARM64 if TARGET_SOCFPGA_SOC64
 	select CPU_V7A if TARGET_SOCFPGA_GEN5 || TARGET_SOCFPGA_ARRIA10
 	select DM
 	select DM_SERIAL
@@ -982,7 +982,7 @@
 	select SPL_LIBGENERIC_SUPPORT
 	select SPL_NAND_SUPPORT if SPL_NAND_DENALI
 	select SPL_OF_CONTROL
-	select SPL_SEPARATE_BSS if TARGET_SOCFPGA_STRATIX10 || TARGET_SOCFPGA_AGILEX
+	select SPL_SEPARATE_BSS if TARGET_SOCFPGA_SOC64
 	select SPL_SERIAL_SUPPORT
 	select SPL_SYSRESET
 	select SPL_WATCHDOG_SUPPORT
@@ -991,7 +991,7 @@
 	select SYS_THUMB_BUILD if TARGET_SOCFPGA_GEN5 || TARGET_SOCFPGA_ARRIA10
 	select SYSRESET
 	select SYSRESET_SOCFPGA if TARGET_SOCFPGA_GEN5 || TARGET_SOCFPGA_ARRIA10
-	select SYSRESET_SOCFPGA_SOC64 if TARGET_SOCFPGA_STRATIX10 || TARGET_SOCFPGA_AGILEX
+	select SYSRESET_SOCFPGA_SOC64 if TARGET_SOCFPGA_SOC64
 	imply CMD_DM
 	imply CMD_MTDPARTS
 	imply CRC32_VERIFY