net: phy: tja11xx: enable PHY in sleep mode for TJA1102S

Due to pin strapping the PHY maybe disabled per default. TJA1102 devices
can be enabled by setting the PHY_EN bit. Support is provided for TJA1102S
devices but can be easily added for TJA1102 too.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://patch.msgid.link/20250304-tja1102s-support-v2-2-cd3e61ab920f@liebherr.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>