ARM: bcm: stop selecing CONFIG_TICK_ONESHOT

ARCH_BCM_MOBILE is the only platform that selects CONFIG_TICK_ONESHOT,
the others stopped 12 years ago in commit 98fab064 ("ARM: Remove
unnecessary selection of TICK_ONESHOT").

This inconsistency caused a build regression after an otherwise
correct change to the timers subsystem:

kernel/time/tick-sched.c:1599:6: error: redefinition of 'tick_sched_timer_dying'
 1599 | void tick_sched_timer_dying(int cpu)
      |      ^
kernel/time/tick-sched.h:111:20: note: previous definition is here
  111 | static inline void tick_sched_timer_dying(int cpu) { }

Drop this dead select.

Fixes: 3aedb7fc

 ("tick/sched: Remove useless oneshot ifdeffery")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240228123850.3499024-2-arnd@kernel.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>