xen/arm: vpl011: Modify xenconsole functions to take console structure as input

xen/arm: vpl011: Modify xenconsole functions to take console structure as input

Xenconsole functions take domain structure as input. These functions shall be
modified to take console structure as input since these functions typically perform
console specific operations.

Also the console specific functions starting with prefix "domain_" shall be modified
to "console_" to indicate that these are console specific functions.

This patch is in preparation to support multiple consoles to support vuart console.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>