amba_{g,s}et_drvdata macros from linux kernel use
dev_{g,s}et_drvdata functions.

But in linux dev_get_drvdata() takes only one argument
while in barebox dev_get_drvdata() takes two arguments.
There is no dev_set_drvdata() in barebox at all.

So amba_{g,s}et_drvdata macros from linux are
unusable for barebox.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

so we can use it on vexpress to detect the hardware mapping

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This will allow to detect the amba device and use the right driver for it at
runtime.

The code is base on linux 3.5.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>