net: phy: Re-inline phy_drv_reloc()

Wrap phy_drv_reloc() back into phy_init() to reduce ifdeffery,
since phy_drv_reloc() is now called only from one call site.
No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Tested-by: Michal Simek <michal.simek@amd.com> #microblaze (MANUAL_RELOC)