sysreset: Change Kconfig GPIO dependency

DM_GPIO depends on GPIO to be enabled but select will cause that DM_GPIO is
selected without GPIO which ends up in compilation error:
undefined reference to `dm_gpio_set_value'
undefined reference to `dm_gpio_get_value'
undefined reference to `dm_gpio_free'
undefined reference to `gpio_request_by_name'

Signed-off-by: Michal Simek <michal.simek@amd.com>
[trini: Fix configs which had relied on these select's]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/qemu-ppce500_defconfig b/configs/qemu-ppce500_defconfig
index 105b937..5f0746e 100644
--- a/configs/qemu-ppce500_defconfig
+++ b/configs/qemu-ppce500_defconfig
@@ -1,6 +1,7 @@
 CONFIG_PPC=y
 CONFIG_TEXT_BASE=0xf00000
 CONFIG_ENV_SIZE=0x2000
+CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="qemu-ppce500"
 CONFIG_SYS_MONITOR_LEN=524288
 CONFIG_SYS_CLK_FREQ=33000000