ARM: orion5x: Drop unneeded select of PCI_DOMAINS_GENERIC

Support for Marvell Orion SoCs depends on ARCH_MULTI_V5, and thus on
ARCH_MULTIPLATFORM.
As the latter selects GENERIC_CLOCKEVENTS and USE_OF, there is no need
for ARCH_ORION5X and ARCH_ORION5X_DT to select any of them.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: Gregory Clement <gregory.clement@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>