phy: core: Warn when phy_power_on is called before phy_init

phy: core: Warn when phy_power_on is called before phy_init

A warning when the order of phy operation is mixed up by drivers,
this is an atempt to make the phy usage more uniform across (usb)
drivers.

Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: Amelie DELAUNAY <amelie.delaunay@foss.st.com>
Cc: Minas Harutyunyan <hminas@synopsys.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20220407102108.24211-4-jmaselbas@kalray.eu
Signed-off-by: Vinod Koul <vkoul@kernel.org>