net: phy: mediatek: permit to compile test GE SOC PHY driver

net: phy: mediatek: permit to compile test GE SOC PHY driver

When commit 462a3daad679 ("net: phy: mediatek: fix compile-test
dependencies") fixed the dependency, it should have also introduced
an or on COMPILE_TEST to permit this driver to be compile-tested even if
NVMEM_MTK_EFUSE wasn't selected. The driver makes use of NVMEM API that
are always compiled (return error) so the driver can actually be
compiled even without that config.

Fix and simplify the dependency condition of this kernel config.

Fixes: 462a3daad679 ("net: phy: mediatek: fix compile-test dependencies")
Acked-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20250410100410.348-1-ansuelsmth@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>