spl: Allow enabling SPL_OF_REAL and SPL_OF_PLATDATA at the same time

Sandbox unit tests in U-Boot proper load a test device tree to have some
devices to work with. In order to do the same in SPL, we must enable
SPL_OF_REAL. However, we already have SPL_OF_PLATDATA enabled. When
generating platdata from a devicetree, it is expected that we will not need
devicetree access functions (even though SPL_OF_CONTROL is enabled). This
expectation does not hold for sandbox, so allow user control of
SPL_OF_REAL.

There are several places in the tree where conditions involving OF_PLATDATA
or OF_REAL no longer function correctly when both of these options can be
selected at the same time. Adjust these conditions accordingly.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/i2c-emul-uclass.c b/drivers/i2c/i2c-emul-uclass.c
index 1107cf3..d421ddf 100644
--- a/drivers/i2c/i2c-emul-uclass.c
+++ b/drivers/i2c/i2c-emul-uclass.c
@@ -46,7 +46,7 @@
 	struct udevice *emul;
 	int ret;
 
-	if (!CONFIG_IS_ENABLED(OF_PLATDATA)) {
+	if (CONFIG_IS_ENABLED(OF_REAL)) {
 		ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
 						    "sandbox,emul", &emul);
 	} else {