ddr: altera: sequencer: add RW_MGR_MEM_NUMBER_OF_RANKS

Fix build error for socfpga_cyclone5_defconfig:

board/altera/socfpga/wrap_sdram_config.c:245:26: error: ‘RW_MGR_MEM_NUMBER_OF_RANKS’ undeclared here (not in a function)
make[2]: *** [spl/board/altera/socfpga/wrap_sdram_config.o] Error 1

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

board/altera/socfpga/qts/sequencer_defines.h

@@ -103,6 +103,7 @@
 #define RW_MGR_MEM_IF_READ_DQS_WIDTH 5
 #define RW_MGR_MEM_IF_WRITE_DQS_WIDTH 5
 #define RW_MGR_MEM_NUMBER_OF_CS_PER_DIMM 1
+#define RW_MGR_MEM_NUMBER_OF_RANKS 1
 #define RW_MGR_MEM_ODT_WIDTH 1
 #define RW_MGR_MEM_VIRTUAL_GROUPS_PER_READ_DQS 1
 #define RW_MGR_MEM_VIRTUAL_GROUPS_PER_WRITE_DQS 1