Blackfin: bf527-ezkit: convert to portmux framework

Rather than bang MMRs directly, use the new portmux framework to handle
the details.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/bf527-ezkit/bf527-ezkit.c b/board/bf527-ezkit/bf527-ezkit.c
index a911880..211cf24 100644
--- a/board/bf527-ezkit/bf527-ezkit.c
+++ b/board/bf527-ezkit/bf527-ezkit.c
@@ -12,6 +12,7 @@
 #include <net.h>
 #include <netdev.h>
 #include <asm/blackfin.h>
+#include <asm/gpio.h>
 #include <asm/net.h>
 #include <asm/mach-common/bits/otp.h>
 
@@ -75,9 +76,7 @@
 	/*
 	 * BF527 EZ-KITs require PG13 to be high for HOST mode
 	 */
-	bfin_write_PORTG_FER(bfin_read_PORTG_FER() & ~PG13);
-	bfin_write_PORTGIO_DIR(bfin_read_PORTGIO_DIR() | PG13);
-	bfin_write_PORTGIO_SET(PG13);
-	SSYNC();
+	gpio_request(GPIO_PG13, "musb-vbus");
+	gpio_direction_output(GPIO_PG13, 1);
 }
 #endif