hal_flash_write() and hal_flash_erase() aligned the invalidation start
address down to a 32-byte cache line but rounded the length up from
"len" alone, omitting the (address - aligned_address) offset. Whenever
(address % 32) + (len % 32) > 32, the invalidated range fell short of
address + len, leaving the last cache line stale after a write/erase.
Extract the range computation into hal_flash_cache_align_range()
(hal/imx_rt.h, dependency-free so it's unit-testable without the
NXP SDK) and include the down-alignment offset before rounding the
length up, so the invalidated range always covers [address, address+len).
Daniele Lacamera