MAINTAINERS: add header file to TI DAVINCI SERIES CLOCK DRIVER

MAINTAINERS: add header file to TI DAVINCI SERIES CLOCK DRIVER

While creating a patch submission on the davinci clock drivers, I noticed
that the header file include/linux/clk/davinci.h belongs to the section
TI DAVINCI SERIES CLOCK DRIVER.

Add a file entry for this header file in TI DAVINCI SERIES CLOCK DRIVER.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220720110026.9173-1-lukas.bulwahn@gmail.com
Reviewed-by: David Lechner <david@lechnology.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>