arm: socfpga: system: Clean up pinmux_config.c

Implement new accessor, sysmgr_get_pinmux_table(), used to obtain pinmux
table and it's size from the QTS-generated pinmux_config.c. The target
here is again to get rid of poluting global namespace by including the
pinmux_config.h into it.

Furthermore, the pinmux_config.h declares some CONFIG_HPS_* macros,
which are explicitly useless to us in U-Boot. Instead, U-Boot does
use DT to detect exactly these configuration options. This patch
makes sure that while this QTS-generated file can stay in the tree,
these obscure macros do not ooze into the namespace anymore.

Signed-off-by: Marek Vasut <marex@denx.de>

include/configs/socfpga_arria5.h

@@ -7,7 +7,6 @@
 #define __CONFIG_SOCFPGA_ARRIA5_H__
 
 #include <asm/arch/socfpga_base_addrs.h>
-#include "../../board/altera/socfpga/qts/pinmux_config.h"
 
 /* U-Boot Commands */
 #define CONFIG_SYS_NO_FLASH

include/configs/socfpga_cyclone5.h

@@ -7,7 +7,6 @@
 #define __CONFIG_SOCFPGA_CYCLONE5_H__
 
 #include <asm/arch/socfpga_base_addrs.h>
-#include "../../board/altera/socfpga/qts/pinmux_config.h"
 
 /* U-Boot Commands */
 #define CONFIG_SYS_NO_FLASH