rust/hw/char/pl011: Extract extract DR read logic into separate function

- Split `read()` DR case into `read_data_register()`

Signed-off-by: Rakesh Jeyasingh <rakeshjb010@gmail.com>
Link: https://lore.kernel.org/r/20250407181327.171563-2-rakeshjb010@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 file changed