staging: android: ion: Make ION_OF depend on OF_ADDRESS
The Ion platform code uses of_platform_device_create which has
dependencies on OF_ADDRESS. Depending on OF is not sufficient
Building sparc64:allmodconfig ... failed
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Error log:
...
drivers/built-in.o: In function `ion_parse_dt':
(.text+0x11aa2c): undefined reference to `of_platform_device_create'