PHY: Add function set_rate to generic PHY framework

This patch adds function set_rate to the generic PHY framework operation
structure. This function can be called to instruct the PHY underlying
layer at specified lane to configure for specified rate.

Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>
PHY: Add Gen1/Gen2 support for the APM SoC X-Gene SATA PHY driver

This patch adds the necessary PHY code to support SATA Gen1/Gen2 for
the APM X-Gene SoC PHY driver.

Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>