arm64: meson: remove COMMON_CLK

This reverts commit aea7a80ad5effd48f44a7a08c3903168be038a43.
Selecting COMMON_CLK is not necessary, it is already selected by
CONFIG_ARM64

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20210609202009.1424879-1-jbrunet@baylibre.com