MAINTAINERS: Add interconnect-clk.h to interconnect API entry

MAINTAINERS: Add interconnect-clk.h to interconnect API entry

Commit 0ac2a08f42ce ("interconnect: add clk-based icc provider
support") introduced include/linux/interconnect-clk.h but missed adding
it to MAINTAINERS.

Since the corresponding implementation drivers/interconnect/icc-clk.c
is already covered by the drivers/interconnect/ directory entry, the
header file should be listed as well.

Fixes: 0ac2a08f42ce ("interconnect: add clk-based icc provider support")
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Link: https://lore.kernel.org/r/20251210181418.2123323-1-visitorckw@gmail.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>