fpga: Export fpga_get_desc for SPL

SPL needs to detect FPGA device which will be used
for loading bitstream.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/fpga/fpga.c

@@ -38,7 +38,7 @@ static void fpga_no_sup(char *fn, char *msg)
 /* fpga_get_desc
  *	map a device number to a descriptor
  */
-static const fpga_desc *const fpga_get_desc(int devnum)
+const fpga_desc *const fpga_get_desc(int devnum)
 {
 	fpga_desc *desc = (fpga_desc *)NULL;
 

include/fpga.h

@@ -52,6 +52,7 @@ typedef enum {
 void fpga_init(void);
 int fpga_add(fpga_type devtype, void *desc);
 int fpga_count(void);
+const fpga_desc *const fpga_get_desc(int devnum);
 int fpga_load(int devnum, const void *buf, size_t bsize,
 	      bitstream_type bstype);
 int fpga_fsload(int devnum, const void *buf, size_t size,