sunxi: Clean up inclusions of asm/arch/gpio.h

As part of migrating to DM_GPIO and DM_PINCTRL, eventually we will
remove the asm/arch/gpio.h header. In preparation, clean up the various
files that include it.

Some files did not contain any GPIO code at all, so this header was
completely unused.

A few files contained only legacy platform-specific GPIO code for
setting up pin muxes. They were left unchanged, as that code will be
completely removed by the DM_PINCTRL migration.

The remaining files contain some combination of DM_GPIO and legacy GPIO
code. For those, switch to including asm/gpio.h (if it wasn't included
already). Right now, this header provides both sets of functions,
because ARCH_SUNXI selects GPIO_EXTRA_HEADER. This will still be the
right header to include once the DM_GPIO migration is complete and
GPIO_EXTRA_HEADER is no longer needed.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index a6eb82b..2e24d12 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -14,9 +14,9 @@
 #include <log.h>
 #include <asm/cache.h>
 #include <asm/global_data.h>
+#include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
-#include <asm/arch/gpio.h>
 #include <common.h>
 #include <clk.h>
 #include <dm.h>
@@ -31,9 +31,6 @@
 #include <reset.h>
 #include <dt-bindings/pinctrl/sun4i-a10.h>
 #include <wait_bit.h>
-#if CONFIG_IS_ENABLED(DM_GPIO)
-#include <asm-generic/gpio.h>
-#endif
 
 #define MDIO_CMD_MII_BUSY		BIT(0)
 #define MDIO_CMD_MII_WRITE		BIT(1)