[bsp][cvitek] add cache opration functions for cache coherence

By default, the small core enables D-Cache without ensuring cache
coherence. Therefore, when using shared memory, inconsistencies can
occur in the data read by the small core and the big core.

Solution: Migrate cache-related functions from the official
duo-buildroot-sdk library to implement cache-related operations in
rthw.h. This allows you to either disable D-Cache or call the
flush_dcache_range function before reading and after writing for
synchronization.

It is recommended to use the flush_dcache_range function, as disabling
D-Cache can have a significant performance impact.

Signed-off-by: zdtyuiop4444 <[email protected]>

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