i.MX: Standardize i.MX GPIO debug

i.MX: Standardize i.MX GPIO debug

The goal is to have debug code always compiled during build.

We standardize all debug output on the following format:

[QOM_TYPE_NAME]reporting_function: debug message

The qemu_log_mask() outputis following the same format as
the above debug.

Reviewed-by: Peter Crosthwaite <[email protected]>
Signed-off-by: Jean-Christophe Dubois <[email protected]>
Message-id: 4f2007adcf0f579864bb4dd8a825824e0e9098b8.1445781957[email protected]
Signed-off-by: Peter Maydell <[email protected]>