arm: socfpga: fpga: Add SoCFPGA FPGA programming interface

Add code necessary to program the FPGA part of SoCFPGA from U-Boot
with an RBF blob. This patch also integrates the code into the
FPGA driver framework in U-Boot so it can be used via the 'fpga'
command.

Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>

V2: Move the not-CPU specific stuff into drivers/fpga/ and base
    this on the cleaned up altera FPGA support.
diff --git a/include/altera.h b/include/altera.h
index e266a64..c2991ad 100644
--- a/include/altera.h
+++ b/include/altera.h
@@ -40,6 +40,8 @@
 	Altera_CYC2,
 	/* StratixII Family */
 	Altera_StratixII,
+	/* SoCFPGA Family */
+	Altera_SoCFPGA,
 
 	/* Add new models here */
 
@@ -91,4 +93,8 @@
 	Altera_post_fn post;
 } altera_board_specific_func;
 
+#ifdef CONFIG_FPGA_SOCFPGA
+int socfpga_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size);
+#endif
+
 #endif /* _ALTERA_H_ */