phy: marvell: rename comphy related definitions to COMPHY_XX

Currently, all comphy definitions are PHY_TYPE_XX and PHY_SPEEED_XX.
Those definition might be confused with MDIO PHY definitions.

This patch does the following changes:
 - PHY_TYPE_XX --> COMPHY_TYPE_XX
 - PHY_SPEED_XX --> COMPHY_SPEED_XX

This improves readability, no functional change.

Change-Id: I2bd1d9289ebbc5c16fa80f9870f797ea1bcaf5fa
Signed-off-by: Igal Liberman <igall@marvell.com>
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>