The psram cache bug fix was also being applied to the bootloader binary (for cmake),
which doesnt do any psram access.
Applying this fix would increase the binary size, as much as 300 bytes in worst case scenarios
Previously, this compiler flag was not being applied
regardless of CONFIG_SPIRAM_CACHE_WORKAROUND setting.
Explanation: add_compile_options() only applies to
source files added after the function is run, or in
subdirectories added after the function is run. In
this case, no new source files were being added after
this function was run.