clocksource: Disallow drivers for ARCH_USES_GETTIMEOFFSET

We can now select clocksource drivers like ti-32k and CONFIG_OF
on ancient machines that still use gettimeoffset, and the combination
results in a link error.

arch/arm/kernel/built-in.o: In function `time_init':
(.init.text+0xc28): undefined reference to `clocksource_probe'

The reason for this is that the Makefile is hidden behind
CONFIG_ARCH_USES_GETTIMEOFFSET, but the Kconfig file is not, and
it has shown up just now because the ti-32k driver was added
and can be selected using COMPILE_TEST on all platforms.

This patch hides the Kconfig menu in CONFIG_ARCH_USES_GETTIMEOFFSET
as well.

Fixes: dfedaf10 "clocksource: ti-32k: make it depend on GENERIC_CLOCKSOURCE"
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Felipe Balbi <balbi@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: http://lkml.kernel.org/r/7579471.4N90fYPQOK@wuerfelSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/clocksource/Kconfig

 menu "Clock Source drivers"
+	depends on !ARCH_USES_GETTIMEOFFSET
 
 config CLKSRC_OF
 	bool