Previously psram driver was in esp_hw_support, which is a common
requirement(when in non-bootloader build). So when building
idf_as_lib (on esp32), the mfix-esp32-psram-cache-issue flag
will always be added (when CONFIG_SPIRAM_CACHE_WORKAROUND is on).
As psram driver is moved to esp_psram component, and esp_psram
is added via idf_component_optional_requires, which is a "weak"
dependency. You need to include esp_psram compoennt explicitly
if psram will be in use.
As idf_as_lib doesn't need psram, this test can be removed.
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