spi/pl022: Add loopback support for the SPI on 5500

Extend the vendor data with a loopback field, and add new
amba-pl022 vendor data for the DB5500 pl023, as the pl023
on db8500 and db5500 vary.

Signed-off-by: Prajadevi H <[email protected]>
Signed-off-by: Philippe Langlais <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
1 file changed