arm: socfpga: rename socfpga_cyclone5 and socfpga_arria5 config files

Rename the socfpga_cyclone5.h to socfpga_cyclone5_socdk.h, and
socfpga_arria.h to socfpga_arria5_socdk.h. This matches the other SoCFPGA
board config files.

Suggested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/mach-socfpga/Kconfig

@@ -50,8 +50,8 @@ config SYS_SOC
 	default "socfpga"
 
 config SYS_CONFIG_NAME
-	default "socfpga_arria5" if TARGET_SOCFPGA_ARRIA5_SOCDK
-	default "socfpga_cyclone5" if TARGET_SOCFPGA_CYCLONE5_SOCDK
+	default "socfpga_arria5_socdk" if TARGET_SOCFPGA_ARRIA5_SOCDK
+	default "socfpga_cyclone5_socdk" if TARGET_SOCFPGA_CYCLONE5_SOCDK
 	default "socfpga_de0_nano_soc" if TARGET_SOCFPGA_TERASIC_DE0_NANO
 	default "socfpga_mcvevk" if TARGET_SOCFPGA_DENX_MCVEVK
 	default "socfpga_sockit" if TARGET_SOCFPGA_TERASIC_SOCKIT