target/openrisc: use coherent syntax in struct initialization

target/openrisc: use coherent syntax in struct initialization

While initializing struct command_registration, the field's name "name"
is not specified, thus relying on the fact that it is the first field
declared in the struct and it's initialization value can be listed as
the first one.

Be coherent in the struct initialization and always use the field's
name.

Change-Id: I65d32870bf4d3df845db69682fe445c71642f976
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5012
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins