memc: stm32_xspi_psram: allow usage on controllers without prefetch options
On some STM32 lines, like the h7rs, there aren't XSPI prefetch options.
To support them in the PSRAM driver, conditionally exclude them from
compilation when the options are not available
Signed-off-by:
Titouan Christophe <titouan.christophe@mind.be>
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