socfpga: Mark socfpga_fpga_add() as static inline in the non-FPGA case

Unless we mark the function as 'static inline' it may end up being
non-inlined by the compiled and result in duplicate functions.

Cc: Marek Vasut <marex@denx.de>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/mach-socfpga/include/mach/misc.h b/arch/arm/mach-socfpga/include/mach/misc.h
index f6de1cc..a85c5ae 100644
--- a/arch/arm/mach-socfpga/include/mach/misc.h
+++ b/arch/arm/mach-socfpga/include/mach/misc.h
@@ -20,7 +20,7 @@
 #ifdef CONFIG_FPGA
 void socfpga_fpga_add(void *fpga_desc);
 #else
-inline void socfpga_fpga_add(void *fpga_desc) {}
+static inline void socfpga_fpga_add(void *fpga_desc) {}
 #endif
 
 #ifdef CONFIG_TARGET_SOCFPGA_GEN5