codegen: add primitive arrays type

Primitive Arrays Parcel can handle null objects directly.
There is no need to use a flag in parcel for special handling
This can generate more efficient code for variables declared as
nullable.

Bug: 233795798
Test: codegen
$ANDROID_BUILD_TOP/packages/services/Car/car-lib/src/android/car/vms/VmsProviderInfo.java

Change-Id: I09a1fcd70d6692b51c5796073001b2c67ad04979