Add the apollo3p_evb board to test the MSPI controller implementation. Signed-off-by: Swift Tian <swift.tian@ambiq.com>
Add a MSPI controller API test and run on native_sim board. The API implementation within mspi_emul.c is the test target. The stub device emulator is added for convenience to test controllers. Signed-off-by: Swift Tian <swift.tian@ambiq.com>