ANDROID: fix build error in arch/arm64/include/asm/arch_timer.h

clang is throwing up when it hits the BUILD_BUG_ON() macro at the
moment, so remove it from arch_time.h for arm64 to fix the build at this
point in time.

Fixes: a1cb8029 ("Merge 57a315cd ("Merge tag 'timers-core-2021-10-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip"

) into android-mainline")
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Marc Zyngier <mzyngier@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I0ccd2fa80b3f9fea92464ba40cd3ca6ad013a5d1