[PATCH v2] fpga: define dummy fpga_load function for debug build

[Chanho Park]

This fixes below build error when CC_OPTIMIZE_FOR_DEBUG is enabled and
CONFIG_FPGA or CONFIG_SPL_FPGA are not enabled.
When CC_OPTIMIZE_FOR_DEBUG is enabled, unused code will not be optimized
out. Hence, fpga_load function must have a dummy implementation to avoid
the build error.

../common/spl/spl_fit.c:591: undefined reference to `fpga_load'
collect2: error: ld returned 1 exit status

Signed-off-by: Chanho Park <chanho61.park at samsung.com>
---
Change from v1:
- Rewrite the commit message to include a CONFIG_FPGA

 include/fpga.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/fpga.h b/include/fpga.h
index ed688cc0fa3b..44f2755a3f10 100644
--- a/include/fpga.h
+++ b/include/fpga.h
@@ -60,8 +60,16 @@ int fpga_add(fpga_type devtype, void *desc);
 int fpga_count(void);
 const fpga_desc *const fpga_get_desc(int devnum);
 int fpga_is_partial_data(int devnum, size_t img_len);
+#if CONFIG_IS_ENABLED(FPGA)
 int fpga_load(int devnum, const void *buf, size_t bsize,
 	      bitstream_type bstype, int flags);
+#else
+static inline int fpga_load(int devnum, const void *buf, size_t bsize,
+	      bitstream_type bstype, int flags)
+{
+	return FPGA_FAIL;
+}
+#endif
 int fpga_fsload(int devnum, const void *buf, size_t size,
 		fpga_fs_info *fpga_fsinfo);
 int fpga_loads(int devnum, const void *buf, size_t size,
-- 
2.39.2