dwc_ahsata: Make sata_write() comply with <part.h>

sata_write() takes a const void as the last argument.  Fixing this means
we also need to make ata_low_level_rw_lba{28,48} also take a const void.

Acked-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>

drivers/block/dwc_ahsata.c

@@ -794,7 +794,7 @@ static void dwc_ahsata_init_wcache(int dev, u16 *id)
 }
 
 u32 ata_low_level_rw_lba48(int dev, u32 blknr, lbaint_t blkcnt,
-				void *buffer, int is_write)
+				const void *buffer, int is_write)
 {
 	u32 start, blks;
 	u8 *addr;
@@ -828,7 +828,7 @@ u32 ata_low_level_rw_lba48(int dev, u32 blknr, lbaint_t blkcnt,
 }
 
 u32 ata_low_level_rw_lba28(int dev, u32 blknr, lbaint_t blkcnt,
-				void *buffer, int is_write)
+				const void *buffer, int is_write)
 {
 	u32 start, blks;
 	u8 *addr;
@@ -863,7 +863,7 @@ u32 ata_low_level_rw_lba28(int dev, u32 blknr, lbaint_t blkcnt,
 /*
  * SATA interface between low level driver and command layer
  */
-ulong sata_read(int dev, unsigned long blknr, lbaint_t blkcnt, void *buffer)
+ulong sata_read(int dev, ulong blknr, lbaint_t blkcnt, void *buffer)
 {
 	u32 rc;
 
@@ -876,7 +876,7 @@ ulong sata_read(int dev, unsigned long blknr, lbaint_t blkcnt, void *buffer)
 	return rc;
 }
 
-ulong sata_write(int dev, unsigned long blknr, lbaint_t blkcnt, void *buffer)
+ulong sata_write(int dev, ulong blknr, lbaint_t blkcnt, const void *buffer)
 {
 	u32 rc;
 	struct ahci_probe_ent *probe_ent =