ARM: qcom_defconfig: Enable HAVE_ARM_ARCH_TIMER

Enable this config in the defconfig so that we can delete the
selection logic surrounding it that exists in mach-qcom/Kconfig.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>