socfpga: Move board/socfpga_cyclone5 to board/socfpga

Because the SOCFPGA platform will include support for Cyclone V and
Arria V FPGA parts, renaming socfpga_cyclone5 folder to socfpga to
be more generic.
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>
Reviewed-by: NPavel Machek <pavel@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Wolfgang Denk <wd@denx.de>
CC: Pavel Machek <pavel@denx.de>
Cc: Tom Rini <trini@ti.com>

v2:
- Add Reviewed-by: Pavel Machek
- Cc: Tom Rini

boards.cfg

@@ -337,7 +337,7 @@ kzm9g                        arm         armv7       kzm9g               kmc
 armadillo-800eva             arm         armv7       armadillo-800eva    atmark-techno  rmobile
 zynq                         arm         armv7       zynq                xilinx         zynq
 zynq_dcc                     arm         armv7       zynq                xilinx         zynq        zynq:ZYNQ_DCC
-socfpga_cyclone5                arm         armv7          socfpga_cyclone5    altera		    socfpga
+socfpga_cyclone5                arm         armv7          socfpga    altera		    socfpga
 actux1_4_16                  arm         ixp         actux1              -              -           actux1:FLASH2X2
 actux1_4_32                  arm         ixp         actux1              -              -           actux1:FLASH2X2,RAM_32MB
 actux1_8_16                  arm         ixp         actux1              -              -           actux1:FLASH1X8