armv7: Add workaround for USB erratum A-008997

armv7: Add workaround for USB erratum A-008997

Low Frequency Periodic Singaling (LFPS) Peak-to-Peak Differential
Output Voltage Test Compliance fails using default transmitter settings

Change config of transmitter signal swings by setting register
PCSTXSWINGFULL to 0x47 to pass compliance tests.

Signed-off-by: Sriram Dash <[email protected]>
Signed-off-by: Rajesh Bhagat <[email protected]>
Signed-off-by: Suresh Gupta <[email protected]>
Signed-off-by: Ran Wang <[email protected]>
[YS: Reordered Kconfig options]
Reviewed-by: York Sun <[email protected]>