Allow writing data to psram directly #1112
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I have a server that prepares a 800 * 480 byte image and the pico writes the bytes directly to the psram backed frame buffer as each packet comes in. This can be seen here: https://github.com/bozenalabs/rain_radar/blob/286b3949439b5dc78bca1af132a5cd2881aea3a7/firmware_c/rain_radar_app/data_fetching.cpp#L150
This PR adds support to do this. The alternatives are to either write each pixel one by one which takes far longer, or to create a jpeg image and then write the jpeg image to the buffer. It is far simpler to just write the image directly the frame buffer.