ddr: altera: sequencer: Clean up mach/sdram.h

Zap non-existent functions and place function prototypes at the
beginning of the header file.

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

arch/arm/mach-socfpga/include/mach/sdram.h

@@ -12,7 +12,7 @@ unsigned long sdram_calculate_size(void);
 int sdram_mmr_init_full(unsigned int sdr_phy_reg);
 int sdram_calibration_full(void);
 
-extern int sdram_calibration(void);
+const struct socfpga_sdram_config *socfpga_get_sdram_config(void);
 
 #define SDR_CTRLGRP_ADDRESS	(SOCFPGA_SDR_ADDRESS | 0x5000)
 
@@ -113,8 +113,6 @@ struct socfpga_sdram_config {
 	u32	phy_ctrl0;
 };
 
-const struct socfpga_sdram_config *socfpga_get_sdram_config(void);
-
 #define SDR_CTRLGRP_CTRLCFG_NODMPINS_LSB 23
 #define SDR_CTRLGRP_CTRLCFG_NODMPINS_MASK 0x00800000
 #define SDR_CTRLGRP_CTRLCFG_DQSTRKEN_LSB 22