h8300: Remove redundant CLKDEV_LOOKUP selects

The h8300 architecture selects COMMON_CLK already, and the COMMON_CLK
config option already selects CLKDEV_LOOKUP so it's redundant to have
this selected again.

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: uclinux-h8-devel@lists.sourceforge.jp
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lkml.kernel.org/r/20200409064416.83340-5-sboyd@kernel.org