clocksource: arch_timer: Push the read/write wrappers deeper

We're going to introduce support to read and write the memory
mapped timer registers in the next patch, so push the cp15
read/write functions one level deeper. This simplifies the next
patch and makes it clearer what's going on.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <Marc.Zyngier@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>

diff --cc arch/arm/include/asm/arch_timer.h
Simple merge

diff --cc arch/arm64/include/asm/arch_timer.h
Simple merge

diff --cc drivers/clocksource/arm_arch_timer.c
Simple merge