ddr: altera: sequencer: Wrap RW_MGR_* macros

Introduce structure socfpga_sdram_rw_mgr_config to wrap the RW manager
configuration values in board file. Introduce a complementary function,
socfpga_get_sdram_rwmgr_config(), which returns this the structure.
This is another step toward wrapping the nasty QTS generated macros
in board files and reducing the pollution of the namespace.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Dinh Nguyen <dinguyen@opensource.altera.com>
diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c
index 31e339b..11f96a5 100644
--- a/drivers/ddr/altera/sequencer.c
+++ b/drivers/ddr/altera/sequencer.c
@@ -41,6 +41,8 @@
 static struct socfpga_sdr_ctrl *sdr_ctrl =
 	(struct socfpga_sdr_ctrl *)SDR_CTRLGRP_ADDRESS;
 
+const struct socfpga_sdram_rw_mgr_config *rwcfg;
+
 #define DELTA_D		1
 
 /*
@@ -3696,6 +3698,8 @@
 	param = &my_param;
 	gbl = &my_gbl;
 
+	rwcfg = socfpga_get_sdram_rwmgr_config();
+
 	/* Set the calibration enabled by default */
 	gbl->phy_debug_mode_flags |= PHY_DEBUG_ENABLE_CAL_RPT;
 	/*