ARM: tegra: include timer as default option

Enable TIMER and TEGRA_TIMER for TEGRA_ARMV7_COMMON and TEGRA210.
Additionally enable SPL_TIMER if build as SPL part and drop
deprecated configs from common header.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom <twarren@nvidia.com>