py/objarray.h: Add mp_obj_memoryview_init() helper function.
py/objarray.h: Add mp_obj_memoryview_init() helper function.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython